Circles

Front

What is the diameter of a circle?

Back

The diameter is a line segment that passes through the center of the circle and connects two points on its circumference.

Front

The _____________ of a circle is two times the radius.

Back

diameter

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

A line that goes from one end of the circle to the other and crosses the center point is called a _____________.

Back

diameter

Front

True or False: A circle has only one radius.

Back

False. A circle has infinitely many radii.

Front

What is the relationship between the diameter and radius of a circle?

Back

The diameter is twice the length of the radius.

Front

If the radius of a circle is 18, what is the diameter?

Back

The diameter is 36.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What formula is used to calculate the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

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.