The height of a right circular cone is 5 cm and its base radius is 12 cm. What is the curved surface area of the cone?
Answer & explanation
Correct answer: option 3
We know that,
The curved surface area of the cone = π × r × l
l2 = r2 + h2
We have,
h = 5 cm
r = 12 cm
= l2 = 144 + 25 = 169
= l = 13 cm
= The curved surface area of the cone = π × 12 × 13 = 156 π cm2