Decagon prism

A regular decagon of side a = 2 cm is the base of the perpendicular prism, the side walls are squares. Find the prism volume in cm3, round to two decimal places.

Correct result:

V =  61.5537 cm3

Solution:

a=2 cm h=a=2=2 cm n=10  S=n/4 a2/tan(π/n)=10/4 22/tan(3.1416/10)30.7768 cm2  V=S h=30.7768 2=61.5537 cm3



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