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2 Trapesium
4 persegi panjang
Cari tinggi sisi tegak trapesium dengan pitagoras.
10² = 6² + x²
100 = 36 + x²
x = √64
x = 8 cm
Luas 2 trapesium = 2.8/2(7+13)
L1 = 160 cm²
Luas 4 persegi panjang = (30×8)+(30×7)+(30×13)+(10×30)
L2 = 240 + 210 + 390 + 300
L2 = 1.140 cm²
Luas permukaan = L1 + L2
Lp = 1140 + 160
Lp = 1.300 cm²