You will need

- Paper, pencil, calculator

Instruction

1

The complete

**surface****of the cone**consists of the sum of the lateral surface of the**cone**and its base. To start the calculation of the surface**of the cone**, you can calculate the surface. Since the base**of the cone**is a circle, use the formula for the area of a circle: S=?R2, where S is the area of the base**of the cone**, ? is a constant equal to 3.14, and R2 is the radius of the base squared.2

Then, calculate the lateral

**surface****of the cone**. This requires the radius of the base multiplied by the length of the generatrix and the resulting value multiplied by mentioned in the previous step ?. (S=Rl?, where S is the lateral surface area**of cone**, R is the base radius, l is the length of the guide, huh ? = 3.14).3

To calculate the full

**surface****of the cone**, find the sum of the squares of the base and the lateral surface of the**cone**.Note

Described formula is not suitable for calculating the area of a truncated cone. If you want to find the area of a truncated cone, use this formula: S = πR2 + πr2 + π(R+r)l, where S is the full area of a truncated cone, π is a constant equal to 3.14, R2 is the radius of the larger base squared, r2 is the radius of the smaller base of the square, l - forms.