Cone-shaped 44161

How many square meters of roofing is needed to cover the cone-shaped roof, if the perimeter of its base is 15.7m and a height of 30dm

Correct answer:

S =  30.6489 m2

Step-by-step explanation:

o=15.7 m h=30 dm m=30:10  m=3 m  o= 2 π r r=o/(2π)=15.7/(2 3.1416)2.4987 m  s=h2+r2=32+2.498723.9043 m  S=π r s=3.1416 2.4987 3.9043=30.6489 m2

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