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A = 90°
C = 36°
B = 180° - (A + C)
= 180° - (90° + 36°)
= 180° - 126°
= 54°
Jadi jawabannya adalah yang C. 54°
Nomor15 ~>
180 = RPQ + PQR + QRP
180 = 3x + 40 + 4x
180 = 7x + 40
7x = 180 - 40
7x = 140
x = 20
RPQ = 3x
= 3(20)
= 60°
Jadi jawabannya adalah yang C. 60°
15. jumlah sudut Δ = 40° + 3x + 4x
180 = 40 + 7x
7x = 180-40
x = 140/7 = 20
besar RPQ = 3x = 3 x 20 = 60°
(jadikan terbaik)