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Diberikan persegi SMAN dengan S ( 3 , 3 ) , M ( − 3 , 3 ) , A ( − 3 , − 3 ) , dan N ( 3 , − 3 ) . Tentukan bayangan persegi karena pencerminan terhadap: c. garis y = 2 x .

Diberikan persegi  dengan , dan . Tentukan bayangan persegi begin mathsize 14px style SMAN end style karena pencerminan terhadap:

c. garis .

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G. Albiah

Master Teacher

Mahasiswa/Alumni Universitas Galuh Ciamis

Jawaban terverifikasi

Jawaban

pencerminanya adalah , , , dan .

pencerminanya adalah S apostrophe open parentheses 33 over 5 comma 21 over 5 close parenthesesM apostrophe open parentheses negative 21 over 5 comma negative 27 over 5 close parenthesesA apostrophe open parentheses 33 over 5 comma 51 over 5 close parentheses, dan N apostrophe open parentheses negative 9 over 5 comma 3 over 5 close parentheses.

Pembahasan

Diketahui, , . Ditanyakan, Pencerminan terhadapgaris . Karena maka, Karena garis merupakan sumbu cermin, berarti maka , 1. Titik Kemudian cari titiknya, Di dapatkan titik . Karena titik tersebut merupakan titik tengah garis, berarti Di dapatkan . 2. Titik , Kemudian cari titiknya, Di dapatkan titik . Karena titik tersebut merupakan titik tengah garis, berarti Di dapatkan . 3. Titik Kemudian cari titiknya, Di dapatkan titik . Karena titik tersebut merupakan titik tengah garis, berarti Di dapatkan . 4. Titik Kemudian cari titiknya, Di dapatkan titik . Karena titik tersebut merupakan titik tengah garis, berarti Di dapatkan . Jadi, pencerminanya adalah , , , dan .

Diketahui,

  •  begin mathsize 14px style straight S left parenthesis 3 comma space 3 right parenthesis end style
  •  Error converting from MathML to accessible text.,
  • Error converting from MathML to accessible text.
  • Error converting from MathML to accessible text..

Ditanyakan,

  • Pencerminan terhadap garis begin mathsize 14px style y equals 2 x end style.

Karena begin mathsize 14px style y equals 2 x end style maka,

table attributes columnalign right center left columnspacing 0px end attributes row y equals cell m x plus c end cell row y equals cell 2 x end cell row m equals 2 end table

Karena garis merupakan sumbu cermin, berarti m times 2 equals negative 1 maka m equals negative 1 half

1. Titik begin mathsize 14px style straight S left parenthesis 3 comma space 3 right parenthesis end style

table attributes columnalign right center left columnspacing 0px end attributes row cell y minus 3 end cell equals cell negative 1 half left parenthesis x minus 3 right parenthesis end cell row cell y minus 3 end cell equals cell negative 1 half x plus 3 over 2 end cell row cell y plus 1 half x minus 3 minus 3 over 2 end cell equals 0 row cell 2 y plus x minus 6 minus 3 end cell equals 0 row cell 2 y plus x minus 9 end cell equals 0 end table

Kemudian cari titiknya,

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 y plus x minus 9 end cell equals 0 row y equals cell 2 x end cell row blank blank blank row cell 2 left parenthesis 2 x right parenthesis plus x minus 9 end cell equals 0 row cell 4 x plus x minus 9 end cell equals 0 row cell 5 x minus 9 end cell equals 0 row x equals cell 9 over 5 end cell row blank blank blank row y equals cell 2 x end cell row y equals cell 2 open parentheses 9 over 5 close parentheses end cell row y equals cell 18 over 5 end cell end table

Di dapatkan titik open parentheses 9 over 5 comma 18 over 5 close parentheses. Karena titik tersebut merupakan titik tengah garis, berarti

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses 9 over 5 comma 18 over 5 close parentheses end cell equals cell open parentheses fraction numerator a plus 3 over denominator 2 end fraction comma fraction numerator b plus 3 over denominator 2 end fraction close parentheses end cell row cell fraction numerator a plus 3 over denominator 2 end fraction end cell equals cell 9 over 5 end cell row cell 5 left parenthesis a plus 3 right parenthesis end cell equals cell 2 cross times 9 end cell row cell 5 a plus 15 end cell equals 18 row cell 5 a end cell equals cell 18 plus 15 end cell row cell 5 a end cell equals 33 row a equals cell 33 over 5 end cell row blank blank blank row cell fraction numerator b plus 3 over denominator 2 end fraction end cell equals cell 18 over 5 end cell row cell 5 left parenthesis b plus 3 right parenthesis end cell equals cell 2 left parenthesis 18 right parenthesis end cell row cell 5 b plus 15 end cell equals 36 row cell 5 b end cell equals cell 36 minus 15 end cell row cell 5 b end cell equals 21 row b equals cell 21 over 5 end cell end table

Di dapatkan S apostrophe open parentheses 33 over 5 comma 21 over 5 close parentheses.

2. Titik Error converting from MathML to accessible text.,

table attributes columnalign right center left columnspacing 0px end attributes row cell y minus left parenthesis negative 3 right parenthesis end cell equals cell negative 1 half left parenthesis x minus 3 right parenthesis end cell row cell y plus 3 end cell equals cell negative 1 half x plus 3 over 2 end cell row cell y plus 1 half x plus 3 minus 3 over 2 end cell equals 0 row cell 2 y plus x plus 6 minus 3 end cell equals 0 row cell 2 y plus x plus 3 end cell equals 0 row blank blank blank row blank blank blank end table

Kemudian cari titiknya,

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 y plus x plus 3 end cell equals 0 row y equals cell 2 x end cell row blank blank blank row cell 2 left parenthesis 2 x right parenthesis plus x plus 3 end cell equals 0 row cell 4 x plus x plus 3 end cell equals 0 row cell 5 x plus 3 end cell equals 0 row x equals cell negative 3 over 5 end cell row blank blank blank row y equals cell 2 x end cell row y equals cell 2 open parentheses negative 3 over 5 close parentheses end cell row y equals cell negative 6 over 5 end cell end table

Di dapatkan titik open parentheses negative 3 over 5 comma negative 6 over 5 close parentheses. Karena titik tersebut merupakan titik tengah garis, berarti

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses negative 3 over 5 comma negative 6 over 5 close parentheses end cell equals cell open parentheses fraction numerator a minus 3 over denominator 2 end fraction comma fraction numerator b plus 3 over denominator 2 end fraction close parentheses end cell row cell fraction numerator a minus 3 over denominator 2 end fraction end cell equals cell negative 3 over 5 end cell row cell 5 left parenthesis a minus 3 right parenthesis end cell equals cell 2 left parenthesis negative 3 right parenthesis end cell row cell 5 a minus 15 end cell equals cell negative 6 end cell row cell 5 a end cell equals cell negative 6 minus 15 end cell row cell 5 a end cell equals cell negative 21 end cell row a equals cell negative 21 over 5 end cell row blank blank blank row cell fraction numerator b plus 3 over denominator 2 end fraction end cell equals cell negative 6 over 5 end cell row cell 5 left parenthesis b plus 3 right parenthesis end cell equals cell 2 left parenthesis negative 6 right parenthesis end cell row cell 5 b plus 15 end cell equals cell negative 12 end cell row cell 5 b end cell equals cell negative 12 minus 15 end cell row cell 5 b end cell equals cell negative 27 end cell row b equals cell negative 27 over 5 end cell end table

Di dapatkan M apostrophe open parentheses negative 21 over 5 comma negative 27 over 5 close parentheses.

3. Titik  Error converting from MathML to accessible text.

table attributes columnalign right center left columnspacing 0px end attributes row cell y minus left parenthesis negative 3 right parenthesis end cell equals cell negative 1 half left parenthesis x minus left parenthesis negative 3 right parenthesis right parenthesis end cell row cell y plus 3 end cell equals cell negative 1 half x minus 3 over 2 end cell row cell y plus 1 half x plus 3 plus 3 over 2 end cell equals 0 row cell 2 y plus x plus 6 plus 3 end cell equals 0 row cell 2 y plus x plus 9 end cell equals 0 end table

Kemudian cari titiknya,

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 y plus x plus 9 end cell equals 0 row y equals cell 2 x end cell row blank blank blank row cell 2 left parenthesis 2 x right parenthesis plus x plus 9 end cell equals 0 row cell 4 x plus x plus 9 end cell equals 0 row cell 5 x plus 9 end cell equals 0 row x equals cell 9 over 5 end cell row blank blank blank row y equals cell 2 x end cell row y equals cell 2 open parentheses 9 over 5 close parentheses end cell row y equals cell 18 over 5 end cell end table

Di dapatkan titik open parentheses 9 over 5 comma 18 over 5 close parentheses. Karena titik tersebut merupakan titik tengah garis, berarti

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses 9 over 5 comma 18 over 5 close parentheses end cell equals cell open parentheses fraction numerator a minus 3 over denominator 2 end fraction comma fraction numerator b minus 3 over denominator 2 end fraction close parentheses end cell row cell fraction numerator a minus 3 over denominator 2 end fraction end cell equals cell 9 over 5 end cell row cell 5 left parenthesis a minus 3 right parenthesis end cell equals cell 9 cross times 2 end cell row cell 5 a minus 15 end cell equals 18 row cell 5 a end cell equals cell 18 plus 15 end cell row cell 5 a end cell equals 33 row a equals cell 33 over 5 end cell row blank blank blank row cell fraction numerator b minus 3 over denominator 2 end fraction end cell equals cell 18 over 5 end cell row cell 5 left parenthesis b minus 3 right parenthesis end cell equals cell 2 left parenthesis 18 right parenthesis end cell row cell 5 b minus 15 end cell equals 36 row cell 5 b end cell equals cell 36 plus 15 end cell row cell 5 b end cell equals 51 row b equals cell 51 over 5 end cell end table

Di dapatkan A apostrophe open parentheses 33 over 5 comma 51 over 5 close parentheses.

4. Titik  Error converting from MathML to accessible text.

table attributes columnalign right center left columnspacing 0px end attributes row cell y minus 3 end cell equals cell negative 1 half left parenthesis x minus left parenthesis negative 3 right parenthesis right parenthesis end cell row cell y minus 3 end cell equals cell negative 1 half x minus 3 over 2 end cell row cell y plus 1 half x minus 3 plus 3 over 2 end cell equals 0 row cell 2 y plus x minus 6 plus 3 end cell equals 0 row cell 2 y plus x minus 3 end cell equals 0 end table

Kemudian cari titiknya,

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 y plus x minus 3 end cell equals 0 row y equals cell 2 x end cell row blank blank blank row cell 2 left parenthesis 2 x right parenthesis plus x minus 3 end cell equals 0 row cell 4 x plus x minus 3 end cell equals 0 row cell 5 x minus 3 end cell equals 0 row x equals cell negative 3 over 5 end cell row blank blank blank row y equals cell 2 x end cell row y equals cell 2 open parentheses negative 3 over 5 close parentheses end cell row y equals cell negative 6 over 5 end cell end table

Di dapatkan titik open parentheses 3 over 5 comma negative 6 over 5 close parentheses. Karena titik tersebut merupakan titik tengah garis, berarti

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses 3 over 5 comma negative 6 over 5 close parentheses end cell equals cell open parentheses fraction numerator a plus 3 over denominator 2 end fraction comma fraction numerator b minus 3 over denominator 2 end fraction close parentheses end cell row cell fraction numerator a plus 3 over denominator 2 end fraction end cell equals cell 3 over 5 end cell row cell 5 left parenthesis a plus 3 right parenthesis end cell equals cell 2 cross times 3 end cell row cell 5 a plus 15 end cell equals 6 row cell 5 a end cell equals cell 6 minus 15 end cell row cell 5 a end cell equals cell negative 9 end cell row a equals cell negative 9 over 5 end cell row blank blank blank row cell fraction numerator b minus 3 over denominator 2 end fraction end cell equals cell negative 6 over 5 end cell row cell 5 left parenthesis b minus 3 right parenthesis end cell equals cell 2 left parenthesis negative 6 right parenthesis end cell row cell 5 b minus 15 end cell equals cell negative 12 end cell row cell 5 b end cell equals cell negative 12 plus 15 end cell row cell 5 b end cell equals 3 row b equals cell 3 over 5 end cell end table

Di dapatkan N apostrophe open parentheses negative 9 over 5 comma 3 over 5 close parentheses.

 
Jadi, pencerminanya adalah S apostrophe open parentheses 33 over 5 comma 21 over 5 close parenthesesM apostrophe open parentheses negative 21 over 5 comma negative 27 over 5 close parenthesesA apostrophe open parentheses 33 over 5 comma 51 over 5 close parentheses, dan N apostrophe open parentheses negative 9 over 5 comma 3 over 5 close parentheses.

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