What is a circle?
Q: What is a circle?
A: A circle is a round, two-dimensional shape. All points on the edge of the circle are at the same distance from the center.
Q: What does mathematicians use to represent the length of a circle's radius?
A: Mathematicians use the letter r for the length of a circle's radius.
Q: What is written as O in circles?
A: The center of a circle is often written as O.
Q: How long is the diameter of a circle?
A: The diameter (meaning "all the way across") of a circle is a straight line that goes from one side to the opposite and right through the center of the circle. It is equal to twice its radius (d equals 2 times r).
Q: What letter do mathematicians use to represent circumference?
A: Mathematicians use C for circumference, which means "all around".
Q: How can we calculate area inside a circle?
A: The area, A, inside a circle can be calculated by multiplying its radius by itself and then multiplied by π (A equals π times r times r).
