Radius and Diameter

Front

What is the diameter of a circle?

Back

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

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

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

Back

The diameter is 20 cm.

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 diameter if you know the radius?

Back

Multiply the radius by 2.

Front

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

Back

Divide the diameter by 2.

Front

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

Back

The diameter is 14 cm.

Front

Is the line segment connecting two points on the circumference of a circle a radius or diameter?

Back

It can be a radius if it connects the center to the circumference, or a diameter if it connects two points through the center.

Front

What is the diameter of a circle with a radius of 5.5 cm?

Back

The diameter is 11 cm.

Front

If a circle has a diameter of 16 cm, what is its radius?

Back

The radius is 8 cm.