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Jumlah sudut pada trapesium adalah 360°
maka :
∠P + ∠S + ∠QRS + ∠PQR = 360°
90° + 90° + 130° + ∠PQR = 360°
310° + ∠PQR = 360°
∠PQR = 360° - 310°
∠PQR = 50°
No. 4
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