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= √(144-36)
= √108
= 6√3
La= 1/2 x 12 x 6√3
= 36√3
V= La . t
= 36√3 . 15
= 540√3
= (12 x 12) : 2 = 144 : 2
= 72 cm2.
volum= 72 cm2 x 15 cm = 1080 cm3.
.
.maka hasil ny. *1080cm3.