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Area of a right triangle

This math skill demonstrates how to calculate the area of a right triangle by considering it as half of a rectangle built around the triangle. Multiply the two side lengths of the rectangle and then divide by two to find the triangle's area.

Learn area of a right triangle

Teaching Transcript

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Let's find the area of a right triangle with sides of length 9 and 6.

We can think of a rectangle that surrounds it. In this case a 9 by 6 rectangle would have an area of 54.

The area of the triangle cuts that in half, so divide 54 by 2 and you get an area of 27

Skill Practice

Area of a right triangle

Test your understanding of area of a right triangle by practicing it! Work through the below exercises to use it in practice.