Question

A right cone has a radius of 13 cm and a slant height of 20 cm. Find its surface area.

Question 12 options:



A)

10,618.6 cm2



B)

816.8 cm2



C)

1,347.7 cm2



D)

3,539.5 cm2

Answer 1

`A=1347.7\ cm^2`

Explanation:

Given that,

Radius of a cone, r = 13 cm

Slant height of the cone, l = 20 cm

We need to find the surface area of the cone. The formula for the surface area of the cone is given by :

`A=\pi rl +\pi r^2`

Put all the values,

`A=\pi r(l + r)\\\\A=\pi * 13(20 + 13)\\\\A=1347.7\ cm^2`

So, the surface area of the cone is
`1347.7\ cm^2`.