Radius | Radii (English)
Search for " Radius " OR " Radii " in NRICH | PLUS | maths.org | Google
Definition (keystage 2)
The radius of a circle is the distance from the centre of the circle to its edge. The radius of a regular polygon is the distance from the centre of the polygon to any one of its vertices.
The plural of radius is radii.
The plural of radius is radii.
Relations
- broader:
- (en) Lines in a circle
- narrower:
- (en) Circumradius
- (en) Radius of a regular polygon
- (en) Radius of curvature
- references:
- (en) Circle
- referenced:
- (en) Area of a circle
- (en) Chord or secant line
- (en) Circular helix
- (en) Descartes' circle theorem
- (en) Inradius
- (en) Power of a point
- (en) Type A (OHP picture area)
- (en) Type B (OHP picture area)
Funded by: EU Socrates Minerva, HeyMath!, Cambridge University Press