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Pada segitiga ABC diketahui sisi AB = 6 cm, AC = 1...

Pada segitiga ABC diketahui sisi AB = 6 cm, AC = 10 cm, dan sudut A equals 60 to the power of 0. Panjang sisi BC = ....

  1. 2 square root of 19 c m

  2. 3 square root of 19 c m

  3. 4 square root of 19 c m

  4. 2 square root of 29 c m

  5. 3 square root of 29 c m

Jawaban:

B C squared equals A B squared plus A C squared minus 2 space A B space B C space cos space A  B C squared equals 6 squared plus 10 squared equals 2 cross times 6 cross times 10 cross times cos space 60 to the power of 0  B C squared equals 36 plus 100 minus 120 cross times 1 half  B C squared equals 136 minus 60  B C squared equals 76

Jadi, 

B C equals square root of 76  B C equals 2 square root of 19

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