Question

Find the surface area of the cone.

Answer 1

The formula of a surface area of a cone:

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

r - radius

l - slant height

We have r = 7cm and l = 10cm. Substitute:

`S.A.=\pi(7^2)+\pi(7)(10)=49\pi+70\pi=119\pi`

Answer: 119π cm²