Question

Find the surface area of a cone whose base is a circle with a 5 cm radius and whose altitude is 10 cm.

Answer 1

l² = h² + r²

l² = 10² + 5²

l² = 125

l = 5√5

Surface area = πr(r + l)

Area = 22/7 × 5 (5 + 5√5)

Area = 550/7 × (1 + √5)

Answer 2

about 254.16

Explanation:

A=πr(r+h2+r2)