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=4. a×t/2 + 20×20
=4. 20.24/2 +400
=4×240+400
=960+400 =1360 cm2
V = 1/3 Luas alas x Tinggi
= 1/3 S/S x Tinggi
= 1/3 24x24 x 20
= 1/3 576 x 20
= 192 x 20
= 3840