(1): \(S_{xq}=\left(11+6.5\right)\cdot2\cdot\dfrac{5}{6}=\dfrac{175}{6}\left(cm^2\right)\)
Sđáy=11*6,5=71,5cm2
V=11*6,5*5/6=715/12cm3
(2): S đáy=7/2*3,2=11,2dm2
Sxq=(3,5+3,2)*2*4=53,6dm2
V=3,5*3,2*4=3,5*12,8=44,8dm3
(3): S đáy=2,5*3/8=15/16m2
Sxq=(2,5+3/8)*2*5,3=30,475m2
V=2,5*3/8*5,3=159/32m3