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bangunan atas 30 × 24 = 72
bangunan bawah 30 + 90 × 25 ÷ 2 = 1.500
bangunan samping 38 × 38 = 1.444
luas seluruhnya 72 + 1.500 + 1.444 = 3.016
no 5
bangunan 1 : 30 × 30 ÷ 2 = 450
bangunan 2 : 37 × 25 = 925
bangunan 3 : 37 × 37 = 1.369
luas seluruhnya 450 + 925 + 1.369 = 2.744