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ABC + ADB + AEB = 75°
Sk + Sk + Sk = 75°
3Sk = 75°
Sk = 25°
Sp (Sudut pusat) = 2Sk
= 2(25)
= 50°
QOP = Sp = 130°
QRP = Sk
2QRP = QOP
QRP = QOP/2
QRP = 130/2
= 65°