# 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 , the height , and an approximation for into the formula.

Remove parentheses around .

Raise to the power of .

Multiply by .

Multiply by .

Remove parentheses around .

Raise to the power of .

Remove parentheses around .

Raise to the power of .

Add and .

Rewrite as .

Factor out of .

Rewrite as .

Pull terms out from under the radical.

Simplify .

Multiply by .

Multiply by .

Add and .