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La = s²
= 90²
= 8100cm²
b.
v = 26.000cm³
= 26.000
8100.t = 26.000 x3
t =
t = 9,63cm
luas alas = s x s -------> ini rumusnya
= 90 x 90
= 8100
b.
volume = 1/3 x luas alas x TL
26000 = 1/3 x 8100 x TL
26000 = 2700 TL
TL = 9,63