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Program to find the volume and total surface area of a cone

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C      Program to find the volume and total surface area of a cone
        write(*,*)'Enter the radius:'
        read(*,*)r
        write(*,*)'Enter the height:'
        read(*,*)h
        a=acos(-1.0)*r*(r+sqrt(r*r+h*h))
        v=((acos(-1.0)*r*r*h)/3.0)
        write(*,10)a
        write(*,20)v
10    format(2x,'The total surface area of the cone is',f16.4)
20    format(2x,'The volume of the cone is',f16.4)
        end
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