Square prism

Calculate the volume of a foursided prism 2 dm high, the base is a trapezoid with bases 12 cm, 6 cm, height of 4 cm and 5 cm long arms.

Correct result:

V =  0.72 dm3

Solution:

h=2 dm a=12 cm→ dm=12/10  dm=1.2 dm c=6 cm→ dm=6/10  dm=0.6 dm v=4 cm→ dm=4/10  dm=0.4 dm  S=(a+c)⋅ v/2=(1.2+0.6)⋅ 0.4/2=925=0.36 dm2  V=S⋅ h=0.36⋅ 2=1825=1825 dm3=0.72 dm3

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