Quadrilateral 29201

How much sheet is needed for a roof with the shape of a regular quadrilateral pyramid if its edge is 2.8 m long and the height of the roof is 0.8 m?Calculate 10% for the overlap (extra).

Correct answer:

S =  9.9327 m2

Step-by-step explanation:

a=2.8 m h=0.8 m  h2=h2+(a/2)2=0.82+(2.8/2)21.6125 m S1=a h2/2=2.8 1.6125/22.2574 m2 S2=4 S1=4 2.25749.0297 m2 q=100%+10%=1+10010=1.1  S=S2 q=9.0297 1.1=9.9327 m2

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