The formula for finding the area of a circle is pi times the radius squared. If you were given a circle and the only measurement you had was the radius, it would be enough to find the area. Lets say you have a circle with a radius of 3 feet. The first thing you have to is to square the radius, so you get 9 because 3 times 3 is 9. Next you multiply 9 by pi (3.14). 9 times 3.14 is 28.26, so the area of a circle with a radius of 3 inches is 28.26 square inches.
If you know the radius of a circle you can also use it to find the circumference of it. The first thing you need to do is find the diameter, which of course is 2 times the radius, equaling 6 feet in this case since the radius is 3 feet. Once you know what the diameter is all you have left to do is multiply it by Pi; so you would multiply 6 times 3.14 which equals 18.84 and that is the circumference. Now you should hopefully understand how to find the area and circumference of a circle.
If you know the radius of a circle you can also use it to find the circumference of it. The first thing you need to do is find the diameter, which of course is 2 times the radius, equaling 6 feet in this case since the radius is 3 feet. Once you know what the diameter is all you have left to do is multiply it by Pi; so you would multiply 6 times 3.14 which equals 18.84 and that is the circumference. Now you should hopefully understand how to find the area and circumference of a circle.
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