Parts of a Circle Pre-Flashcard

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle, passing through the center. It is twice the length of the radius.

Front

How do you convert radius to diameter?

Back

To convert radius to diameter, multiply the radius by 2.

Front

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What is the formula for the circumference of a circle?

Back

The formula for circumference is C = πd or C = 2πr, where d is the diameter and r is the radius.

Front

What is the area of a circle?

Back

The area is the space contained within the circle.

Front

What is the formula for the area of a circle?

Back

The formula for area is A = πr², where r is the radius.

Front

True or False: A circle has only one radius.

Back

False. A circle has infinitely many radii, all equal in length.

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.