Question

The cone below has a radius of 10 cm.

30 cm
10 cm'
Calculate the surface area of the cone.
Give your answer correct to 1 decimal place.
Curved surface area of cone= πrl

Answer 1

1256.6 cm²

Explanation:

A cone is given with base radius of 10 cm and slant height of 30 cm.

π = 3.14159

r = radius = 10 cm

L = slant height = 30 cm

SA = πr² + πrL = πr(r + L)

SA = 3.14159(10 cm)(10 cm + 30 cm)

SA = 1256.636 cm²

Answer: 1256.6 cm²