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Verified answer
4.Karena itu segitiga sama kaki, maka 2 sudut sama besar.
∠PRS = 21°
∠SQR = 21°
∠PRQ = 42°
∠PSQ = 42 x 2 = 84° (karena sudut pusat adalah 2 x sudut keliling).
5.
∠BAD = 130/2 = 65°
∠BCD = 130° (karena saling berseberangan).