Circle: Radius and Diameter

Front

What is the definition of the diameter of a circle?

Back

The diameter of a circle is the distance from one edge of the circle to the opposite edge, passing through the center.

Front

What is the definition of the radius of a circle?

Back

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

Front

If the diameter of a circle is 30 cm, what is the radius?

Back

15 cm

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (Diameter = 2 x Radius).

Front

How do you calculate the diameter if you know the radius?

Back

Diameter = 2 x Radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = π x Diameter.

Front

What is the formula for the area of a circle?

Back

Area = π x (Radius)^2.

Front

If a circle has a radius of 10 m, what is its diameter?

Back

20 m

Front

What is the diameter of a circle with a radius of 25 inches?

Back

50 inches

Front

If the diameter of a circle is 100 ft, what is the radius?

Back

50 ft