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12t = 180°
t = 180/12
t = 15°
sudut R = 15°
2t = 2. 15
2t = 30°
sudut P = 30°
9t = 9.15
9t = 135°
sudut Q = 135°
5) PQ = 2.12
PQ = 24cm
luas = 24. 5 ÷ 2
L = 60cm2