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Pertanyaan

Titik-titik sudut segitiga ABC adalah A ( 0 , 2 ) , B ( − 3 ​ , − 1 ) , dan C ( 3 ​ , − 1 ) . Tentukan bayangan △ ABC karena rotasi berikut. a. [ O ( 0 , 0 ) , R ( 3 2 ​ π ) ]

Titik-titik sudut segitiga  adalah , , dan . Tentukan bayangan  karena rotasi berikut.

a.  

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G. Albiah

Master Teacher

Mahasiswa/Alumni Universitas Galuh Ciamis

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titik-titik sudut segitiga adalah , , dan .

titik-titik sudut segitiga begin mathsize 14px style ABC end style adalah straight A apostrophe left parenthesis negative square root of 3 comma space minus 1 right parenthesis, straight B apostrophe left parenthesis square root of 3 comma space minus 1 right parenthesis, dan straight C apostrophe left parenthesis 0 comma space 2 right parenthesis.

Pembahasan

Transformasi rotasi ., Maka, 1. 2. 3. Jadi, titik-titik sudut segitiga adalah , , dan .

Transformasi rotasi straight R open parentheses 2 over 3 straight pi close parentheses.,

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 over 3 straight pi end cell equals cell 2 over 3 cross times 180 end cell row blank equals cell 360 over 3 end cell row blank equals 120 end table

Maka,

1. undefined

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell cos space 120 space end cell cell negative sin space 120 end cell row cell sin space 120 end cell cell cos space 120 end cell end table close parentheses open parentheses table row x row y end table close parentheses end cell row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell negative 1 half end cell cell negative 1 half square root of 3 end cell row cell 1 half square root of 3 end cell cell negative 1 half end cell end table close parentheses open parentheses table row 0 row 2 end table close parentheses end cell row blank equals cell open parentheses table row cell 2 open parentheses negative 1 half square root of 3 close parentheses end cell row cell 2 open parentheses negative 1 half close parentheses end cell end table close parentheses end cell row blank equals cell open parentheses table row cell negative square root of 3 end cell row cell negative 1 end cell end table close parentheses end cell end table

2. begin mathsize 14px style straight B left parenthesis negative square root of 3 comma space minus 1 right parenthesis end style

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell cos space 120 space end cell cell negative sin space 120 end cell row cell sin space 120 end cell cell cos space 120 end cell end table close parentheses open parentheses table row x row y end table close parentheses end cell row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell negative 1 half end cell cell negative 1 half square root of 3 end cell row cell 1 half square root of 3 end cell cell negative 1 half end cell end table close parentheses open parentheses table row cell negative square root of 3 end cell row cell negative 1 end cell end table close parentheses end cell row blank equals cell open parentheses table row cell open parentheses negative 1 half times negative square root of 3 close parentheses plus open parentheses negative 1 half square root of 3 times negative 1 close parentheses end cell row cell open parentheses 1 half square root of 3 times negative square root of 3 close parentheses plus open parentheses negative 1 half times negative 1 close parentheses end cell end table close parentheses end cell row blank equals cell open parentheses table row cell 1 half square root of 3 plus 1 half square root of 3 end cell row cell negative 3 over 2 plus 1 half end cell end table close parentheses end cell row blank equals cell open parentheses table row cell square root of 3 end cell row cell negative 1 end cell end table close parentheses end cell end table

3. undefined

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell cos space 120 space end cell cell negative sin space 120 end cell row cell sin space 120 end cell cell cos space 120 end cell end table close parentheses open parentheses table row x row y end table close parentheses end cell row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell negative 1 half end cell cell negative 1 half square root of 3 end cell row cell 1 half square root of 3 end cell cell negative 1 half end cell end table close parentheses open parentheses table row cell square root of 3 end cell row cell negative 1 end cell end table close parentheses end cell row blank equals cell open parentheses table row cell open parentheses negative 1 half times square root of 3 close parentheses plus open parentheses negative 1 half square root of 3 times negative 1 close parentheses end cell row cell open parentheses 1 half square root of 3 times square root of 3 close parentheses plus open parentheses negative 1 half times negative 1 close parentheses end cell end table close parentheses end cell row blank equals cell open parentheses table row cell negative 1 half square root of 3 plus 1 half square root of 3 end cell row cell 3 over 2 plus 1 half end cell end table close parentheses end cell row blank equals cell open parentheses table row 0 row 2 end table close parentheses end cell end table

Jadi, titik-titik sudut segitiga begin mathsize 14px style ABC end style adalah straight A apostrophe left parenthesis negative square root of 3 comma space minus 1 right parenthesis, straight B apostrophe left parenthesis square root of 3 comma space minus 1 right parenthesis, dan straight C apostrophe left parenthesis 0 comma space 2 right parenthesis.

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