Radius, Diameter, and Circumference of circles

Front

What is the radius of a circle?

Back

The measurement from the center of a circle to an edge of the circle.

Front

What is the diameter of a circle?

Back

The measurement from one edge of the circle to the opposite edge, passing through the center.

Front

If the radius of a circle is 10 ft, what is the diameter?

Back

20 ft

Front

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

Back

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

Front

What is the circumference of a circle with a radius of 7 cm?

Back

43.96 cm (using π ≈ 3.14).

Front

What is the distance around a circle called?

Back

Circumference.

Front

If the diameter of a circle is 12 ft, what is the radius?

Back

6 ft

Front

What is π (pi)?

Back

A mathematical constant approximately equal to 3.14, used in calculations involving circles.

Front

How do you find the area of a circle?

Back

Area = π × radius².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.