Question

What is the surface area of the right cone below?

A. 63π units²

B. 54π units ²

C. 99π units²

D. 126π units²

Answer 1

B. 54π units ²

Explanation:

solution:

given,

Radius (r) = 3

(l) = 15

we know that,

T.S.A. of cone = πr( r + l )

= π × 3(3 + 15)

= π × 3 × 18

= π × 54

= 54π units ²