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Circles can come up in easy, medium or hard math questions. Memorizing key circle formulas will help you
solve them quickly.
The diameter of a circle is a straight line that connects 2 different parts of a circle and travels through the
center point of the circle.
The radius connects the center point of a circle with a point on the circle.
p is used in many circle formulas and is equal to approximately 3.14 when rounded.
The circumference of a circle is the distance around the circle. It can be found with the following formula:
2pr
Which is similar to:
pd
The area of a circle, which is all the space enclosed inside of the circle can be found with the following
formula:
pr2
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