Storm and roof

The roof on the building is a cone with a height of 3 meters and a radius equal to half the height of the roof. How many m2 of roof need to be repaired if 20% were damaged in a storm?

Correct result:

x =  3.1612 m2

Solution:

h=3 m r=h/2=3/2=32=1.5 m q=20%=20100=0.2  s=h2+r2=32+1.523.3541 m x=q π r s=0.2 3.1416 1.5 3.3541=3.1612 m2



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