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Luas alas =...??
s= 1/2 (7+8+9)
= 1/2 x 24
=12
Luas alas = √12(12-7)(12-8)(12-9)
=√12(5)(4)(3)
=√720
=12√5
V= 12√5 x 12
= 144√5 cm^3