The cone is a body in which basis the circle lies. Out of the plane of this circle there is a point called cone top, and pieces which connect cone top to basis circle points are called forming a cone.
It is required to you
- Paper, pencil, calculator
Instruction
1. Full surface coneof consists from the sum of a side surface of a cone and its basis. It is possible to begin calculation of a surface of a cone with calculation of a surface of the basis. As the basis of a cone is the circle, use a formula of the area of a circle: S=? R2 where S is the area of the basis of a cone? - it is the constant equal 3.14, and R2 is a radius of the basis in a square.
2. Now calculate a side surface of a cone. For this purpose it is necessary the radius of the basis to increase by length forming and the received value to increase by the number mentioned in the previous step?. (S=Rl?, where S is the area of a side surface of a cone, R - the radius of the basis, l - guide length, and? = 3.14).
3. To calculate a full surface of a cone, find the sum of the areas of the basis and side surface of a cone.