The formula for finding the area of a triangle is , where b is the length of the base and h is the height of the triangle. Suppose you know the area and height of the triangle, but need to find the length of the base. In this case, solving the formula for b would be helpful. Solve the area formula for b, then write a sentence describing how to find the base of a triangle given the area and height.

Begin isolating b by multiplying both sides of the equation by the reciprocal of , or 2.

Divide both sides of the resulting equation by h.

Summarize your results.

This applet is provided by Walch Education as supplemental material for the CCSS Traditional Pathway: Algebra I program. Visit www.walch.com for more information on our resources.