Question

Bantu ya cari trigonometri pada segitiga sembarang .

Answer 1

6/sin 30° = 9/sin a
sin a = 9 sin 30°/6
sin a = 9/12 = 3/4

cos a = √(1 - sin² a)
cos a = √(1 - 9/16)
cos a = √(7/16)
cos a = √7/4