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TL =
= √144
= 12
Volume Limas = 1/3 x luas alas x TL
= 1/3 x 18 x 18 x 12
= 1296
maka:
t limas = akar dr 15²-9²
= akar dr 225-81
= √144
= 12 cm
jadi, V limas = 1/3.L alas.t
= 1/3.s².t
= 1/3.18².12
= 4.324
= 1296 cm kubik