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S =116/4 = 29Cm
Setengah D1 = 40/2 = 20cm
OD = 21cm (Tripel pythagroas 20-21-29)
D2 = 2OD = 2X21 = 42cm
Luas belah ketupat = 1/2 D1 D2 = 1/2 X 29 X 42 = 609 cm²