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How can I find the radius of a circle?

How do i find the radius of a circle?

  • Answer:

    circumference = pie times diameter radius is half of the diameter so if you have either the circumference or the diameter, you can figure it out.

mjherrer... at Yahoo! Answers Visit the source

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It depends what information you already have. If you know the diameter, then the radius is half of that. If you know the area, then use the equation pi*r^2, where r is the radius. If you know the circumference, then use the equation pi*d, where d is the diameter.

wizard of ozma

The half of the diametere of the circle is its radius.

scarlet speedster

take a ruler and see where the circle is most wide and then divide by 2

rajanumolu

Measure from one side of the circle to the other in a straight line.This is the diameter. Whatever value you get,you then divide it by 2. This is the radius. An example is as follows : If the circle diameter is 10cm. (10/2 = 5) Therefore the radius is 5cm

tallaboy2002

draw a square inside the circle , the radius of the circle is 1/2 of any diagonal of the square...(geometrically) Or draw a square around the circle,, the radius will be 1/2 of the straight line from the middle of any two opposite sides of the square

Zoser

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