Question

The height of a paper cone-shaped cup is 33 cm and the diameter of the paper cone-shaped cup is 20 cm, how much paper was used?

Answer 1

`A=1397.38\ cm^2`

Explanation:

Given that,

The height of the paper cone shaped, h = 33 cm

The diameter of the cone, d = 20 cm

Radius = (20/2) = 10 cm

oWe need to find how much paper was used. It means we need to find the total surface area of the cone.

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

Where

l is the slant height,

`l=√(r^2+h^2) \\\\=√(10^2+33^2) \\\\=34.48\ cm`

So,

`A=\pi * 10* 34.48+\pi (10)^2\\\\=1397.38\ cm^2`

So,
`1397.38\ cm^2` of the paper was used.