Chord of a Circle: Definition & Formula


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What is a chord of a circle?

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1. Find the length of chord AB in the circle given the information in this image:

2. Find the length of chord AB in the circle given the information in this image:

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About This Quiz & Worksheet

While you might already be familiar with diameters and radiuses, chords are another important line associated with circles. This quiz and worksheet will help assess your knowledge of what chords are and how to use them in equations to find more information about a circle.

Quiz & Worksheet Goals

This quiz will ask you to:

  • Define chord
  • Use your knowledge to find the length of a chord
  • Use the Pythagorean theorem with chords to find more information

Skills Practiced

Some skills you will get a chance to use are:

  • Defining key concepts -ensure that you can accurately define main phrases, such as chord
  • Problem solving - use acquired knowledge to solve practice problems using chords and the Pythagorean theorem
  • Knowledge application - use your knowledge to answer questions about finding the length of chords of a circle

Additional Learning

To learn more about chords, review the accompanying lesson entitled Chord of a Circle: Definition & Formula. This lesson covers the following objectives:

  • Demonstrating the definition of a chord
  • Differentiating between chords, diameters, and secants
  • Showing how to use equations to solve for the length of a chord