Question

21 Maizel wants to make snow

cone cups. If each cone has a
base diameter of 3.5 in and a
height of 4 in, how much paper
does each cone take to make?
Note: No paper is needed to
cover the base of the cone.
a) 4.4 in²
b) 24 in²
c) 33.6 in²
d)14 in2

Answer 1

24

Explanation:

the area of the whole cone would be

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

`l` would be
`l=√(r^2+h^2)`

so if we substitute;

`\pi *1.75*(1.75+√(4^2+1.75^2))`

this gives us a total surface area of 33.6

BUT, we don't want the base of the cone, we lets subtract it by getting the area of a circle respective to the base radius.

`a=\pi r^2`

`a=\pi *1.75^2`

`a=9.6`

so the final area would be
`33.6-9.6=24`