Circle Basics

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 edge.

Front

What is the diameter of a circle?

Back

The diameter is the distance through the center of the circle from one edge to the opposite edge. It is twice the radius.

Front

If the diameter of a circle is 70 cm, what is the radius?

Back

35 cm

Front

If the radius of a circle is 50 cm, what is the diameter?

Back

100 cm

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What units are used for measuring the radius?

Back

Units (e.g., cm, m) are used for measuring the radius.

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

Front

How do you calculate the circumference of a circle?

Back

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.