A cone is one of the more interesting shapes that are present in geometry. Using a circle as a base, lines are drawn to a specific point, creating a unique three dimensional shape. This point is usually described as being the vertex, or apex, of the cone. There are actually two kinds of cones, the right circular cones and the oblique circular cones. In a right circular cone, all of the lines that are extended from the circular base have the same measurement. On the other hand, the oblique circular cones have an apex that is not equidistant from all of the points on the perimeter of the base. Instead, the apex is at an angle, meaning that the distance will vary depending on the starting point from the base. To see illustrations of the two types of cones, a visit to arithmetic.com will provide plenty of examples. The arithmetic.com website is the premier source for online math knowledge and they have special sections devoted to the many geometrical shapes.

To find the area of one of these cones, the Cone Area Formula must be used. The formula is broken up into two parts. The first part identifies the area of the cone sides and the second part calculates the area of the base. The base part is actually easy because it is simply a circle and used the A=Pi(r*r) formula. However, the sides are a bit more difficult and a height for the cone will need to be obtained. This is done by creating a triangle that has a right angle at the central point of the circle, with one of the sides being a radius of the circle. After the height has been determined, the length of the s line of the triangle can be figured out by using the Pythagorean Theorem. Therefore, the entire Cone Area Formula is A=Pirs Pi(r*r). To determine the area, a person will only need to add the values determined for the s line of the triangle and the length of the radius of the circle and then calculate the total cone area.