the formula is PI(3.14)(radius)squared
first is to find the radius they usually give and you like the fullthing so you have to cut it in half like for example the radius is 14 so you cut in half which is 7.next you take 7 and multiply it by itself which is 49.(be sure to NOT multiply 7x2=14)then you multiply everything together.so here it is.(3.14x49)And that's how you find the radius of a circle.(i think....)
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The radius of a circle is half its diameter (the measure of the circle from one side across to the other).
the radius is from the center of the circle to the edge so that's how you find the radius.
Radius is one-half of the diameter of a circle. Therefore, the radius of an eight-inch diameter circle is four inches. The diameter of a circle is a straight line joining a point on the circumference through the centre to the 'opposite' point on the circumference.
Diameter = 2*Radius
The radius is a lenght, and it's impossible to find out the radius if you don't give any information about the size of your circle.