Question

The curved surface area of a cone is 7150 cm2 and radius of base of the cone is 35cm. Find the slant height and the perpendicular height.

Answer 1

CSA of cone = 7150 cm²

πrl= 7150 cm²

22/7 × 35 × l = 7150

22 × 5 × l= 7150

l = 7150 / 22 × 5

l = 65

by using ,l²=h²+r²

65² = h² +35²

4225 = h² + 1225

h² = 4225 - 1225

h² = 3000

squaring on both side

h = 54.77