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Pertanyaan

Titik A(x,y) dirotasi sebesar 45° berlawanan arah jarum jam dengan pusat O(0,0) menghasilkan bayangan . Bayangan dari titik A jika dirotasi sebesar 45° searah jarum jam dengan pusat O(0,0) adalah ....

Titik A(x,y) dirotasi sebesar 45° berlawanan arah jarum jam dengan pusat O(0,0) menghasilkan bayangan begin mathsize 14px style A subscript 1 superscript apostrophe open parentheses 2 square root of 2 comma negative 6 square root of 2 close parentheses end style. Bayangan dari titik A jika dirotasi sebesar 45° searah jarum jam dengan pusat O(0,0) adalah ....

  1. begin mathsize 14px style A subscript 2 superscript apostrophe open parentheses 6 square root of 2 comma negative 2 square root of 2 close parentheses end style 

  2. begin mathsize 14px style A subscript 2 superscript apostrophe open parentheses negative 6 square root of 2 comma 2 square root of 2 close parentheses end style 

  3. begin mathsize 14px style A subscript 2 superscript apostrophe open parentheses negative 2 square root of 2 comma 6 square root of 2 close parentheses end style 

  4. begin mathsize 14px style A subscript 2 superscript apostrophe open parentheses negative 6 square root of 2 comma negative 2 square root of 2 close parentheses end style 

  5. begin mathsize 14px style A subscript 2 superscript apostrophe open parentheses negative 2 square root of 2 comma negative 6 square root of 2 close parentheses end style 

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Y. Laksmi

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

didapat titik bayangannya adalah .

didapat titik bayangannya adalah begin mathsize 14px style A subscript 2 superscript apostrophe open parentheses negative 6 square root of 2 comma negative 2 square root of 2 close parentheses end style.

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Pembahasan

Ingat bahwa titik A(x, y) jika dirotasi dengan sudut rotasi sebesar θ berlawanan arah jarum jam dengan pusat O(0, 0), maka didapat titik bayangan A’(x’,y’) dengan Pada soal diketahui titik A dirotasi sebesar 45° berlawanan arah jarum jam dengan pusat O(0,0) menghasilkan bayangan . Sehingga θ = 45°, . Maka didapatkan hubungan Sehingga didapat dengan menggunakan metode eliminasi, didapat bahwa Substitusi nilai x ke salah satu persamaan, misal persamaan kedua, maka didapat Sehingga didapat titik A(-4, -8). Selanjutnya titik A(-4, -8) dirotasi sebesar 45° searah jarum jam dengan pusat O(0,0). Sehingga didapat x = -4, y = -8, dan θ = -45°. Maka didapat hubungan Sehingga didapat titik bayangannya adalah .

Ingat bahwa titik A(x, y) jika dirotasi dengan sudut rotasi sebesar θ berlawanan arah jarum jam dengan pusat O(0, 0), maka didapat titik bayangan A’(x’,y’) dengan

undefined

Pada soal diketahui titik A dirotasi sebesar 45° berlawanan arah jarum jam dengan pusat O(0,0) menghasilkan bayangan undefined
Sehingga θ = 45°, begin mathsize 14px style x to the power of apostrophe equals 2 square root of 2 space d a n space y to the power of apostrophe equals negative 6 square root of 2 end style.

Maka didapatkan hubungan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row cell x to the power of apostrophe end cell row cell y to the power of apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell cos invisible function application theta end cell cell negative sin invisible function application theta end cell row cell sin invisible function application theta end cell cell cos invisible function application theta 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 2 square root of 2 end cell row cell negative 6 square root of 2 end cell end table close parentheses end cell equals cell open parentheses table row cell cos invisible function application 45 degree end cell cell negative sin invisible function application 45 degree end cell row cell sin invisible function application 45 degree end cell cell cos invisible function application 45 degree 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 2 square root of 2 end cell row cell negative 6 square root of 2 end cell end table close parentheses end cell equals cell open parentheses table row cell 1 half square root of 2 end cell cell negative 1 half square root of 2 end cell row cell 1 half square root of 2 end cell cell 1 half square root of 2 end cell end table close parentheses open parentheses table row x row y end table close parentheses end cell row cell 1 half square root of 2 open parentheses table row 4 row cell negative 12 end cell end table close parentheses end cell equals cell 1 half square root of 2 open parentheses table row 1 cell negative 1 end cell row 1 1 end table close parentheses open parentheses table row x row y end table close parentheses end cell row cell open parentheses table row 4 row cell negative 12 end cell end table close parentheses end cell equals cell open parentheses table row 1 cell negative 1 end cell row 1 1 end table close parentheses open parentheses table row x row y end table close parentheses end cell row cell open parentheses table row 4 row cell negative 12 end cell end table close parentheses end cell equals cell open parentheses table row cell x minus y end cell row cell x plus y end cell end table close parentheses end cell end table end style

Sehingga didapat

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell x minus y end cell equals 4 row cell x plus y end cell equals cell negative 12 end cell end table end style

dengan menggunakan metode eliminasi, didapat bahwa

begin mathsize 14px style table row cell x minus y equals 4 end cell blank row cell bottom enclose x plus y equals negative 12 end enclose end cell plus row cell 2 x equals negative 8 end cell blank row cell x equals negative 4 end cell blank end table end style

Substitusi nilai x ke salah satu persamaan, misal persamaan kedua, maka didapat

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell x plus y end cell equals cell negative 12 end cell row cell negative 4 plus y end cell equals cell negative 12 end cell row y equals cell negative 12 plus 4 end cell row y equals cell negative 8 end cell end table end style

Sehingga didapat titik A(-4, -8).

Selanjutnya titik A(-4, -8) dirotasi sebesar 45° searah jarum jam dengan pusat O(0,0). Sehingga didapat x = -4, y = -8, dan θ = -45°.
Maka didapat hubungan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row cell x to the power of apostrophe end cell row cell y to the power of apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell cos invisible function application theta end cell cell negative sin invisible function application theta end cell row cell sin invisible function application theta end cell cell cos invisible function application theta 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 to the power of apostrophe end cell row cell y to the power of apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell cos invisible function application open parentheses negative 45 degree close parentheses end cell cell negative sin invisible function application open parentheses negative 45 degree close parentheses end cell row cell sin invisible function application open parentheses negative 45 degree close parentheses end cell cell cos invisible function application open parentheses negative 45 degree close parentheses end cell end table close parentheses open parentheses table row cell negative 4 end cell row cell negative 8 end cell end table close parentheses end cell row cell open parentheses table row cell x to the power of apostrophe end cell row cell y to the power of apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell 1 half square root of 2 end cell cell negative open parentheses negative 1 half square root of 2 close parentheses end cell row cell negative 1 half square root of 2 end cell cell 1 half square root of 2 end cell end table close parentheses open parentheses table row cell negative 4 end cell row cell negative 8 end cell end table close parentheses end cell row cell open parentheses table row cell x to the power of apostrophe end cell row cell y to the power of apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell 1 half square root of 2 end cell cell 1 half square root of 2 end cell row cell negative 1 half square root of 2 end cell cell 1 half square root of 2 end cell end table close parentheses open parentheses table row cell negative 4 end cell row cell negative 8 end cell end table close parentheses end cell row cell open parentheses table row cell x to the power of apostrophe end cell row cell y to the power of apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell 1 half square root of 2 open parentheses negative 4 close parentheses plus 1 half square root of 2 open parentheses negative 8 close parentheses end cell row cell negative 1 half square root of 2 open parentheses negative 4 close parentheses plus 1 half square root of 2 open parentheses negative 8 close parentheses end cell end table close parentheses end cell row cell open parentheses table row cell x to the power of apostrophe end cell row cell y to the power of apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell negative 2 square root of 2 minus 4 square root of 2 end cell row cell 2 square root of 2 minus 4 square root of 2 end cell end table close parentheses end cell row cell open parentheses table row cell x to the power of apostrophe end cell row cell y to the power of apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell negative 6 square root of 2 end cell row cell negative 2 square root of 2 end cell end table close parentheses end cell end table end style

Sehingga didapat titik bayangannya adalah begin mathsize 14px style A subscript 2 superscript apostrophe open parentheses negative 6 square root of 2 comma negative 2 square root of 2 close parentheses end style.

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