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Diketahui jajargenjang PQRS seperti gambar. Panjang diagonal PR = ....

Diketahui jajargenjang PQRS seperti gambar. Panjang diagonal PR = ....

  1. begin mathsize 14px style 5 square root of 3 space cm end style

  2. begin mathsize 14px style 6 square root of 3 space cm end style

  3. begin mathsize 14px style 7 square root of 2 space cm end style

  4. begin mathsize 14px style 7 square root of 3 space cm end style

  5. 8 cm

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S. Intan

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

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begin mathsize 14px style Sudut space SPQ equals 60 degree space maka space sudut space PQR equals 120 degree space  sehingga space pada space segitiga space PQR space berlaku  PR squared equals PQ squared plus QR squared minus 2 straight space PQ straight space. straight space QR space cos invisible function application space straight Q  PR squared equals 6 squared plus 6 squared minus 2 straight space. straight space 6 straight space. straight space 6 space cos space invisible function application 120 degree  PR squared equals 36 plus 36 minus 72 straight space open parentheses negative 1 half close parentheses  PR squared equals 72 plus 36  PR squared equals 108  PR equals square root of 108  PR equals 6 square root of 3 straight space cm end style

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