Glass

How many glass are needed to produce glass with base regular 5-gon if one base triangle in the base is 4.2 square cm and the height is 10 cm?

Correct result:

S =  195.6848 cm2

Solution:

S1=5⋅ 4.2=21 h=10 S1=5/4 a2 tan⁡(54∘) a=4⋅ S1/5/tan⁡54∘=tan⁡3π/10=3.4937 o=5⋅ a=5⋅ 3.4937≐17.4685 S=S1+o⋅ h=21+17.4685⋅ 10=195.6848 cm2

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