To find the radius of a circle when you are given the diameter, you can use a simple formula. The radius is half the length of the diameter.
The formula to find the radius (r) is:
r = d / 2
Where:
- r is the radius of the circle
- d is the diameter of the circle
For example, if the diameter of a circle is 10 units, you would calculate the radius as follows:
r = 10 / 2 = 5
So, the radius of the circle would be 5 units. This relationship stems from the definition of the circle itself, where the diameter is defined as the distance across the circle through its center, making the radius exactly half of that distance.