Question

Find the surface area of a cone with a radius of 8 cm and a slant height of 17.9 cm round to the nearest tenth

Answer 1

Explanation:

Given that,

Radius of cone, r = 8 cm

Slant height of the cone, l = 17.9 cm

We need to find the surface area of a cone. The a cone, its surface area is given by :

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

Putting the values of r and l in above formula such that,

`A=\pi (r^2+rl)\\\\A=(22)/(7)* ((8)^2+8* 17.9)\\\\A=651.2\ cm^2`

So, the surface area of a cone is
`651.2\ cm^2`. Hence, this is the required solution.