Area of the cone

Calculate the surface area of the cone, you know the base diameter 25 cm and a height 40 cm.

Correct result:

S =  2136.5829 cm2

Solution:

D=25 cm r=D/2=25/2=252=12.5 cm h=40 cm s=h2+r2=402+12.52≐41.9076 cm S1=π⋅ r2=3.1416⋅ 12.52≐490.8739 cm2 S2=π⋅ r⋅ s=3.1416⋅ 12.5⋅ 41.9076≐1645.709 cm2 S=S1+S2=490.8739+1645.709=2136.5829 cm2

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