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Persamaan lingkaran yang sepusat dengan lingkaran lain yang memiliki persamaan x 2 + y 2 − 2 x + 6 y + 12 = 0 dan berjari-jari 8 satuan adalah ....

Persamaan lingkaran yang sepusat dengan lingkaran lain yang memiliki persamaan  dan berjari-jari  satuan adalah ....

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  2. begin mathsize 14px style x squared plus y squared minus 2 x plus 6 y minus 54 equals 0 end style 

  3. begin mathsize 14px style x squared plus y squared plus 2 x minus 6 y minus 54 equals 0 end style 

  4. begin mathsize 14px style x squared plus y squared minus 6 x plus 2 y plus 54 equals 0 end style 

  5. begin mathsize 14px style x squared plus y squared minus 6 x plus 2 y minus 54 equals 0 end style 

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W. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sriwijaya

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah B.

jawaban yang benar adalah B.

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Pembahasan

Diketahui persamaan , maka: sehingga persamaan lingkaran yang sepusatdan berjari-jari satuan dapat di tentukan dengan cara: - Pilihan A dengan persamaan - Pilihan B dengan persamaan - Pilihan C dengan persamaan - Pilihan D dengan persamaan - Pilihan E dengan persamaan Jadi, jawaban yang benar adalah B.

Diketahui persamaan begin mathsize 14px style x squared plus y squared minus 2 x plus 6 y plus 12 equals 0 end style, maka:

begin mathsize 14px style straight P open parentheses fraction numerator straight A over denominator negative 2 end fraction comma space fraction numerator straight B over denominator negative 2 end fraction close parentheses equals straight P open parentheses fraction numerator negative 2 over denominator negative 2 end fraction comma space fraction numerator 6 over denominator negative 2 end fraction close parentheses equals straight P open parentheses 1 comma space minus 3 close parentheses end style 

sehingga persamaan lingkaran yang sepusat dan berjari-jari begin mathsize 14px style 8 end style satuan dapat di tentukan dengan cara:

- Pilihan A dengan persamaan size 14px x to the power of size 14px 2 size 14px plus size 14px y to the power of size 14px 2 size 14px minus size 14px 2 size 14px x size 14px plus size 14px 6 size 14px y size 14px plus size 14px 54 size 14px equals size 14px 0 

begin mathsize 14px style straight P open parentheses fraction numerator straight A over denominator negative 2 end fraction comma space fraction numerator straight B over denominator negative 2 end fraction close parentheses equals straight P open parentheses fraction numerator negative 2 over denominator negative 2 end fraction comma space fraction numerator 6 over denominator negative 2 end fraction close parentheses equals straight P open parentheses 1 comma space minus 3 close parentheses straight r equals square root of open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared plus open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared minus straight C end root equals square root of 1 squared plus open parentheses negative 3 close parentheses squared minus 54 end root equals square root of negative 44 end root end style 

- Pilihan B dengan persamaan begin mathsize 14px style x squared plus y squared minus 2 x plus 6 y minus 54 equals 0 end style 

begin mathsize 14px style straight P open parentheses fraction numerator straight A over denominator negative 2 end fraction comma space fraction numerator straight B over denominator negative 2 end fraction close parentheses equals straight P open parentheses fraction numerator negative 2 over denominator negative 2 end fraction comma space fraction numerator 6 over denominator negative 2 end fraction close parentheses equals straight P open parentheses 1 comma space minus 3 close parentheses straight r equals square root of open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared plus open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared minus straight C end root equals square root of 1 squared plus open parentheses negative 3 close parentheses squared plus 54 end root equals square root of 64 equals 8 end style 

- Pilihan C dengan persamaan begin mathsize 14px style x squared plus y squared plus 2 x minus 6 y minus 54 equals 0 end style 

begin mathsize 14px style straight P open parentheses fraction numerator straight A over denominator negative 2 end fraction comma space fraction numerator straight B over denominator negative 2 end fraction close parentheses equals straight P open parentheses fraction numerator 2 over denominator negative 2 end fraction comma space fraction numerator negative 6 over denominator negative 2 end fraction close parentheses equals straight P open parentheses negative 1 comma space 3 close parentheses straight r equals square root of open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared plus open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared minus straight C end root equals square root of open parentheses negative 1 close parentheses squared plus open parentheses 3 close parentheses squared plus 54 end root equals square root of 64 equals 8 end style 

- Pilihan D dengan persamaan begin mathsize 14px style x squared plus y squared minus 6 x plus 2 y plus 54 equals 0 end style 

begin mathsize 14px style straight P open parentheses fraction numerator straight A over denominator negative 2 end fraction comma space fraction numerator straight B over denominator negative 2 end fraction close parentheses equals straight P open parentheses fraction numerator negative 6 over denominator negative 2 end fraction comma space fraction numerator 2 over denominator negative 2 end fraction close parentheses equals straight P open parentheses 3 comma space minus 1 close parentheses straight r equals square root of open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared plus open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared minus straight C end root equals square root of 3 squared plus open parentheses negative 1 close parentheses squared minus 54 end root equals square root of negative 44 end root end style 

- Pilihan E dengan persamaan begin mathsize 14px style x squared plus y squared minus 6 x plus 2 y minus 54 equals 0 end style 

begin mathsize 14px style straight P open parentheses fraction numerator straight A over denominator negative 2 end fraction comma space fraction numerator straight B over denominator negative 2 end fraction close parentheses equals straight P open parentheses fraction numerator negative 6 over denominator negative 2 end fraction comma space fraction numerator 2 over denominator negative 2 end fraction close parentheses equals straight P open parentheses 3 comma space minus 1 close parentheses straight r equals square root of open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared plus open parentheses fraction numerator straight A over denominator negative 2 end fraction close parentheses squared minus straight C end root equals square root of 3 squared plus open parentheses negative 1 close parentheses squared plus 54 end root equals square root of 64 equals 8 end style 

Jadi, jawaban yang benar adalah B.

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