How to Find the Area of an Isosceles Triangle


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1. If A is the area, b is the base, and h is the height of an isosceles triangle, what is the formula for the area of the triangle?

2. If an isosceles triangle has a base of length 9 inches and a height of length 3 inches, what is the area of the triangle?

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About This Quiz & Worksheet

This quiz and worksheet tests your knowledge of isosceles triangles and how to find the area of them. You'll check your understanding of the formula and your ability to correctly use it to solve problems.

Quiz & Worksheet Goals

This quiz and worksheet focuses on what you know about:

  • Features of isosceles triangles
  • The formula for the area of a triangle
  • Solving sample problems
  • Understanding the Pythagorean theorem

Skills Practiced

  • Interpreting information - verify that you read and were able to correctly interpret information about features of an isosceles triangle
  • Knowledge application - use your knowledge of the formula for the area of a triangle to answer a question about it
  • Problem solving - use your understanding of finding the area of isosceles triangles to solve problems correctly

Additional Learning

There is a full discussion on this topic in the lesson named How to Find the Area of an Isosceles Triangle. This lesson covers more detail about:

  • Defining isosceles triangles
  • The parts of an isosceles triangle
  • Solving for the area of triangles with example problems
  • The significance of right triangles