Question

Mohoh dibantu.. no. 28 dan 29

Answer 1

Dik : ∠P = 105°, ∠Q = 45°, PQ = 30cm
dit : panjang sisi PR?
jawab :
∠P + ∠Q + ∠R = 180°
∠R = 180° - 105° - 45°
∠R = 30°

rumus
sin(Q)/PR = sin(R)/PQ
sin45°/PR = sin30°/30
PR = sin45°/sin30° x 30
PR = 1/2 / 1/2√2 x 30
PR = 30√2

∴ jawaban : D