Nilai sin ㄥACB = …
Jawab:
a = 5 cm, b = 6 cm, c = 7 cm
cos c = a² + b² – c²
2 . 5 . 6
= 5² + 6² – 7²
2.5.6
= 25 + 36 – 49
60
= 12
60
= 1
5
Dengan syarat mencari sin c yakni sin²c + cos²c = 1.
sin c = √1 – cos² c
= √1 – 1
25
= √24
√25
= √4.6/√25
= 2√6
5