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(12 + 18 ) . 9 / 2 = 30 . 9 / 2
15.9 = 135 cm
*THX ^-^
=½ x (s1 + s2) x t
=½ x (12+ 18) x 9
= ½ x 30× 9
=135cm
10) volume balok
=p.l.t
=10×7×9
=560cm