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One might wonder why we care about chords, circles, and the like, but there''s a reason: We need to be as accurate and as specific as possible in the world. So what exactly is a "chord?" We''ll soon find out.

Chords, explained

A chord is a line that passes through a circle or curved line. While the chord is straight, the segment that it passes through is not. A chord can pass through one or multiple curved segments or arcs.

When a chord passes through a circle, it creates "endpoints" on the boundary or perimeter of the circle.

Visualizing chords

Take a look at the following diagram to visualize how chords work:

Here we can see a total of two chords passing through the circle:

AB and AC

You might already be familiar with one type of chord called a diameter. A diameter is a chord that passes through the center of the circle. As such, this is the longest possible chord of a circle.

Fun facts about chords

There are a number of theorems or "rules" that involve chords. For example:

  • Two minor arcs are congruent only if their corresponding chords are congruent
  • Two chords are congruent if they are equidistant from the center

Topics related to the Chord


Angle of Intersecting Chords Theorem

Intersecting Chords Theorem

Flashcards covering the Chord

Basic Geometry Flashcards

Common Core: High School - Geometry Flashcards

Practice tests covering the Chord

Common Core: High School - Geometry Diagnostic Tests

Intermediate Geometry Diagnostic Tests

Pair your student with a private math instructor to help them cover chords

Understanding early concepts like chords is critical, and tutors can help hammer home key lessons that might have been misunderstood during class time. Tutors can explain these concepts in new ways depending on your student''s hobbies or learning style. They can also challenge more advanced students with fun exercises if they''re getting bored in class. Reach out to Varsity Tutors today, and we''ll pair your student with an appropriate tutor.

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