FormulasSolving equations that involve formulas.

A formula is an algebraic equation that relates two or more quantities.

distance = rate • time

Distance

PerimeterA measure of the distance around a geometric figure.

triangle

rectangle

Area rectangle

trianglesquare units of the interior region of a two dimensional figure or the surface of a three dimensional figure.

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Example 1 Use a variable expression to find the distance traveled by a truck moving at an average speed of 65 miles per hour for 6 hours.

1.Write the formula.

2. Substitute.

3. Simplify.

4. Write a sentence.

Example 2 Find the perimeter of a triangle with two sides 5 miles long and one side 3 miles long.

1. Write the formula.

2. Substitute.

3. Simplify.

4. Write a sentence.

Example 3 Find the area of a triangle with base 15 centimeters and height 8 centimeters.

1. Write the formula.

2. Substitute.

3. Simplify.

4. Write a sentence.