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

Answer:

$A=1397.38\ cm^2$

Step-by-step 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,

$l=\sqrt{r^2+h^2} \\\\=\sqrt{10^2+33^2} \\\\=34.48\ cm$

So,

$A=\pi \times 10\times 34.48+\pi (10)^2\\\\=1397.38\ cm^2$

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