.
If you know the diameter
radius = ___
D
2
D  is the diameter of the circle
If you know the circumference
radius = ___
π  is Pi, approximately 3.142
C
2π
C  is the circumference of the circle
If you know the area
A  is the area of the circle
π  is Pi, approximately 3.142
Finding the Radius of a Circle:
The radius of a circle is measured from the center of
a circle to a point on the circle. The radius is half
the length of diameter.
radius of a circle
homepage
Homepage
> Radius Of A Circle < you are here
.
radius and diameter
In this diagram the blue line 8.0, is the radius and red
line 16.0
is the diameter. You can see that the radius
is measured from the center of the circle and it is half
the length of the diameter.
There are three formulas you can use to find the
radius.
.........................................................................................................................................................................................
a circle
video
Related pages
.
Sign Up Now