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∠SPQ = 40°
∠QRS = ∠RSP = 140° karena sudut yg berdekatan berjumlah 180°. Jadi kalau ∠PQR = 40°, ∠QRS = ∠RSP = 140° (dpt dr 180°-40° = 140°)
kalo pusing, pake gambar aja hahaha
b. pasangan sisi sm pjg adalah RQ dan SP