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12x²/2 = 600
6x² = 600
x² = 100
x = 10 cm
D1 = 4x = 4.10 = 40 cm
D2 = 3x = 3.10 = 30 cm
sisi miring = √20² + 15² = 25 cm
4 kali sisi miring ada 4 segitiga = keliling
4.25 = keliling
100 cm = keliling