﻿ Definition and examples radius | define radius - Free Math Dictionary Online

## Related Words

Radius is the distance from the center of a circle or a sphere to any point on the circle or a sphere.

In other words, radius is a line segment joining the center of a circle with any point on the circle.

is a radius of the circle shown.

### Video Examples: How to Find a Radius Between Two Points

• A. 8
• B. 7
• C. 6
• D. 5

#### Solution:

• Step 1: Area of a circle of radius r = π r2 [Original equation.]
• Step 2: 153.86 = 3.14 r2 [Substitute values.]
• Step 3: [Divide each side by 3.14.]
• Step 4: 49 = r2 [Simplify.]
• Step 5: [ Evaluate square root on both sides.]
• Step 6: r = 7 [Ignore the negative value.]

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