Radius and Diameter of a Circle

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 circumference.

Front

What is the definition of the diameter of a circle?

Back

The diameter of a circle is the distance across the circle through its center, equal to twice the radius.

Front

If the diameter is 8 cm, what is the radius?

Back

4 cm

Front

If the radius is 2.5 yards, what is the diameter?

Back

5 yards

Front

If the diameter is 20 feet, what is the radius?

Back

10 feet

Front

If the diameter is 2 inches, what is the radius?

Back

1 inch

Front

If the radius is 5 inches, what is the diameter?

Back

10 inches

Front

How do you calculate the diameter from the radius?

Back

Multiply the radius by 2.

Front

How do you calculate the radius from the diameter?

Back

Divide the diameter by 2.

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.