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Luas alas = d1.d2/2
30.40/2 = 1200/2 = 600
sisi miring belah ketupat = √30² + 40² =√900+1600 =√2500 = 50
Luas sisi = p.l
12.50 = 600
Lp = 2( 600) + 4 (600)
1200 + 2400 = 3600 cm²