# Pre-Algebra Examples

The surface area of a cone is equal to the area of the base plus the area of the cone.

Substitute the values of the length and height into the formula. Pi is approximately equal to .

Move to the left of .

Raise to the power of .

Raise to the power of .

Add and .

Rewrite as .

Factor out of .

Rewrite as .

Pull terms out from under the radical.

Apply the distributive property.

Multiply.

Multiply by .

Multiply by .

The result can be shown in multiple forms.

Exact Form:

Decimal Form: