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tinggi=7m
luas =84 m²
dit =sisi alas (a)= ?
dij=luas =(a+b)xt/2
84 m² =(a+8m)x7 m/2
a=(84 m² x 2 /7) ₋8m
=24 - 8 =16 m
jadi sisi alas adalah 16 m