Answer:
[tex]A=1397.38\ cm^2[/tex]
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.
[tex]A=\pi rl+\pi r^2[/tex]
Where
l is the slant height,
[tex]l=\sqrt{r^2+h^2} \\\\=\sqrt{10^2+33^2} \\\\=34.48\ cm[/tex]
So,
[tex]A=\pi \times 10\times 34.48+\pi (10)^2\\\\=1397.38\ cm^2[/tex]
So, [tex]1397.38\ cm^2[/tex] of the paper was used.
