To find the radius of a circle whose diameter you know, you must first rearrange the equation for diameter to solve for the radius. You can do that by dividing both sides of the equation by 2, which gives you the following.
r= d/2
This is the equation you can use to find the radius from the diameter of a circle. Consider a circle with a diameter of 20 centimeters. The calculation to find the circle's radius would look like this:
r= 20cm/2= 10cm
The calculation is the same no matter what the diameter. It's that simple.
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Answer:
Finding the Radius from the Diameter
To find the radius of a circle whose diameter you know, you must first rearrange the equation for diameter to solve for the radius. You can do that by dividing both sides of the equation by 2, which gives you the following.
r= d/2
This is the equation you can use to find the radius from the diameter of a circle. Consider a circle with a diameter of 20 centimeters. The calculation to find the circle's radius would look like this:
r= 20cm/2= 10cm
The calculation is the same no matter what the diameter. It's that simple.