What is a radius ? Definition and examples.

Radius of a circle

The radius of a circle is any line segment from the center of the circle to a point on the circle.

The radius of a circle can also refer to the distance between the center of the circle and any point on the circle. Below, we show the radius with a green segment.

Radius of a circle

Radius of a sphere

The radius of a sphere is any line segment from the center of the sphere to a point on the sphere.

The radius of a sphere can also refer to the distance between the center of the sphere and any point on the sphere. Below, we show the radius with a green segment.

Radius of a sphere

Home

Math words beginning with the letter r

Enjoy this page? Please pay it forward. Here's how...

Would you prefer to share this page with others by linking to it?

  1. Click on the HTML link code below.
  2. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable.
Share this page: