I am eating a snow cone in a paper cone with a height of 21cm and the radius of my snow cone ice is 3.25 cm.

Find the amount of material needed to make my paper snow cone

I forgot to say this. What formula am I suppose to use? The one to find surface area?

Since this is not my area of expertise, I searched Google under the key words "cone area" to get these possible sources:

http://math.about.com/od/formulas/ss/surfaceareavol_2.htm
http://www.uwm.edu/~ericskey/TANOTES/Geometry/node15.html
http://www.webcalc.net/calc/0040_help.php
http://www.rdrop.com/~half/math/cone/surface.area.xhtml
http://www.mathsteacher.com.au/year10/ch14_measurement/18_cone/20cone.htm

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.

i have homework and we have to name this shape below and note one of it's specal properties;i have traiedlooking on pc but i don't know the name of it;have eney one got an idear.r.s.v.p. Sophie-opel evan

To find the amount of material needed to make your paper snow cone, we need to calculate the total surface area of the cone.

The surface area of a cone can be calculated using the formula:

Surface Area = π * r * (r + l)

Where:
- π is a mathematical constant approximately equal to 3.14159 (pi).
- r is the radius of the base of the cone.
- l is the slant height of the cone.

First, let's calculate the slant height (l) of the cone. We can use the Pythagorean theorem to do this.

The Pythagorean theorem states that for any right-angled triangle, the square of the hypotenuse (longest side) is equal to the sum of the squares of the other two sides.

In this instance, the slant height (l) is the hypotenuse, and we know the height (h) and radius (r) of the cone. With this information, we can apply the Pythagorean theorem as follows:

l^2 = r^2 + h^2

Plugging in the values you provided:
l^2 = 3.25^2 + 21^2
l^2 = 10.5625 + 441
l^2 = 451.5625
l ≈ 21.25 cm

Now that we have the slant height (l), we can calculate the surface area of the cone:

Surface Area = π * r * (r + l)
Surface Area = 3.14159 * 3.25 * (3.25 + 21.25)
Surface Area ≈ 3.14159 * 3.25 * 24.5
Surface Area ≈ 252.8727 cm²

Therefore, approximately 252.8727 cm² of paper material is needed to make your paper snow cone.