Radius and Diameter

Front

What is the definition of a radius?

Back

A radius is a straight line from the center of a circle to any point on its circumference.

Front

What is the definition of a diameter?

Back

A diameter is a straight line that passes through the center of a circle and touches two points on its circumference.

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

The diameter is 10 cm (Diameter = 2 x Radius).

Front

What is the relationship between radius and diameter?

Back

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

Front

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

Back

The radius is 6 cm (Radius = Diameter / 2).

Front

Is the line segment from the center to the edge of the circle a radius or diameter?

Back

It is a radius.

Front

Is the line segment that goes through the center and connects two points on the circle a radius or diameter?

Back

It is a diameter.

Front

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

Back

Circumference = π x Diameter.

Front

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

Back

Circumference = 2 x π x Radius.

Front

If a circle has a radius of 3 cm, what is its circumference?

Back

The circumference is approximately 18.85 cm (Circumference = 2 x π x 3).