Octagonal tank

The tank has the shape of a regular octagonal prism without an upper base. The base edge has a = 3m, the side edge b = 6m. How much metal sheet is needed to build the tank? Do not think about losses or sheet thickness.

Correct result:

S =  187.4558 m2

Solution:

a=3 m b=6 m  S1=8 a b=8 3 6=144 m2 S2=2 (1+2) a2=2 (1+2) 3243.4558 m2  S=S1+S2=144+43.4558=187.4558 m2



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