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Lampa20
Surface area of cone is a sum of surface of its base and surface of its mantle.

Surface of its base is a circle which surface we will calculate like this:
Sb = pi*r^2     where r is d/2
Sb = 201m^2

Surface of mantle we calculate by:
Sm = pi*l*r    where l is length of side of cone.

l = [tex] \sqrt{r^2 + H^2} [/tex] = 25.3
Sm = 635.8m^2

Total suface is:
Sb + Sm = 836.8m^2

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