Radius facts for kids

Kids Encyclopedia Facts
The radius of a circle

In geometry, the radius of a circle or sphere is the shortest connection between the center and the boundary. It is half of the diameter.

r= d รท 2

d= 2 x r = d= r + r

r= Radius d= Diameter

The relationship between the radius {\displaystyle r} and the circumference {\displaystyle c} of a circle is ~c = 2\pi r.

The area {\displaystyle A} of a circle of radius {\displaystyle r} is {\displaystyle ~A = \pi r^2.}

Related pages

Radius Facts for Kids. Kiddle Encyclopedia.