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15² + (1/2D2)² = 17²
(1/2D2)² = 17²-15² = 289-225 = 64
1/2D2=√64 = 8cm
D2 = 8 x 2 = 16cm
1/2.d1 x d2 = Luas Ketupat
1/2 x 30 x 16 = 240cm²