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la=1/2×15×20=15×10=150
la×t = 150×12=1800cm 3
(12x15)+(12x25)+(12x20)+2(½x20x15)
= 180+300+240+300
= 1020cm²
volume:
= ½ x 20 x 15 x 12
= 1800 cm³