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AP Calculus AB/BC
The radius is the distance from the center of a circle to any point on its circumference.
congrats on reading the definition of Radius. now let's actually learn it.
Diameter: The diameter is twice the length of the radius, and it goes straight through the center of a circle.
Circumference: The circumference is the distance around the outside edge of a circle.
The area is the amount of space inside a circle.