Calculation 43211

The roof is shaped like a hemisphere with a diameter of 8 m. Calculate how much m2 of roofing is needed to cover the entire top if we count 15% for waste and residues and round the result to tenths of m2. Use the constant pi rounded to two decimal places π=3.14 in the calculation.

Correct answer:

S =  115.6 m2

Step-by-step explanation:

D=8 m q=100%+15%=1+10015=1.15  r=D/2=8/2=4 m S1=2π r2=2 3.1416 42100.531 m2  S=q S1=1.15 100.531=115.6 m2

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