segitiga siku-siku ABC, jika sudut A 90 derajat, jika AC 8 cm dan sudut c 30 derajat, berapakah BC?

ATURAN SINUS

A+B+C = 180
B = 180 - A - C
B = 180 - 90 - 30
B = 60°

BC/sinA = AC/sinB
BC = AC × sinA/sinB
BC = 8 × sin90°/sin60°
BC = 8 × 1 / (1/2 akar3)
BC = 16/3 akar3 cm