The radius and slant height of a cone are in the ratio of 4 : 7. If its curved surface area is 792 cm2, find its radius. (Use π=22/7)
We have,
Let radius of cone = r =4x,
Let slant height = l =7x
Area of curved surface = πrl = 792 cm2
Now, πrl = 792
=
∴r =4×3= 12 cm
l = 7×3 = 21 cm