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21. sama besar = 55 drajat
22. sudut PRQ = 40, maka sudut POQ = 80 (dua kali PRQ)
sudut refleks POQ = 360 - sudut POQ = 360 - 80 = 280
sudut PSQ dan sudut refleks POQ menghadap busur PQ yang besar, maka
sudut PSQ = 1/2 x sudut refleks POQ = 1/2 x 280 = 140 dreajat