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Caranya : Luas ABCD - Luas PAQC
Luas ABCD = 1/2×AC×BD=AO×BD=12×16=192
Pjg OP = akar dari (13^2-12^2)= akar 25 = 5
Luas PAQC = 1/2×AC×PQ=AO×2×OP=12×2×5=120
luas arsiran = 192-120=72