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PRQ ⇨ 180° - 135 ° = 45°
PQR ⇨ 180° - 143° = 37°
Jadi, P ⇨ 180° - ( R + Q)
= 180° - (45° + 37°)
= 180° - 82
= 98° (D)
30) karena sama kaki di B dan C maka B juga 9x
180° = 6x + 9x +9x
180° = 24x
x = 180°/24
x = 7,5°
Jadi A = 6x = 6(7,5) = 45 yg A