Q:
# Do Other Shapes Have a Radius Besides the Circle?

**Some other shapes besides circles that also can have radii are regular polygons like a pentagon or hexagon.** The definition of the radius for a regular polygon is that it is the distance from the center point of the polygon to one of its vertices. Regular polygons are figures that have side lengths that are all congruent.

There are formulas to find the radius if one is given either the side length or the apothem of the regular polygon. The apothem, or inradius, is the distance from its center point to any side. The formula for finding the radius of a regular polygon if the side length is known is given as radius = side length/ 2 sin (180/n), where n is the polygon's number of sides. This formula is useful for problems that involve an inscribed circle in a regular polygon.

For a circle, the radius is the distance from its center point to any point located on the circle edge. The diameter is twice the radius.

Learn more about Geometry-
Q:
## What Is a Radius?

A: The radius of a circle is the length of a line segment from its center to its outer edge. The same definition also applies to the radius of a sphere. Alter... Full Answer >Filed Under: -
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## What Is the Radiius of a Circle?

A: The radius of a circle is the distance from the center of a circle to any point on its edge. The word derives from the Latin word "radius," meaning a staff... Full Answer >Filed Under: -
Q:
## How Do You Measure Diameter?

A: If the radius of the circle is known, the diameter formula is diameter=2R, where R equals the circle's radius. If the circumference of the circle is known,... Full Answer >Filed Under: -
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## What Is the Equation for Arc Length?

A: The length of an arc of a circle is equal to the angle subtended by the arc, in radians, times the radius of the circle. For an angle measured in degrees, ... Full Answer >Filed Under: