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= 72/4
= 18
tingi =√13² - 9²
= √ 169-81
= √ 88
= 2√22
volume = 1/3 x s x s x t
= 1/3 x 18 x 18 x 2√22
= 6 x 18 x 2√22
= 216√22
72 = 4s
s = 18 cm
V = 1/3 x luas alas x t
V = 1/3 x 18 x 18 x 13
V = 1404 cm³