Tentukan besar sudut A

Trigonometri

Gunakan aturan cosinus

BC² = AC² + AB² - 2(AC)(AB) cos A
8² = 6² + 10² - 2(6)(10) cos A
120 cos A = 36 + 100 - 64
cos A = 72/120
cos A = 3/5
A = arccos 3/5
A ≈ 53°