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162 = 1/3 . 81 . t
162 = 27t
t = 162/27
= 6 cm
sisi alas = 9
mencari tinggi sisi tegak (tst) dengan phtagoras
(6 , 1/2 . 9 , tst)
= (6 , 4,5 , tst)
tst² = 6² + 4,5²
tst² = 36 + 20,25
tst² = 50,25
tst = √50,25
tst = 7,5 cm
luas seluruh sisi tegak
= 4 . (9 . 7,5 / 2)
= 2 (67,5)
= 135 cm²