Circumference, Diameter, Radius

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius. To go from radius to diameter, multiply the radius by 2.

Front

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

Back

The circumference (C) can be calculated using the formula C = π × diameter or C = 2 × π × radius.

Front

What is the value of pi (π) approximately?

Back

Pi (π) is approximately 3.14.

Front

If you divide the circumference of a circle by its diameter, what is the result?

Back

The result is always Pi (π).

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

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

Back

To find the diameter, multiply the radius by 2.

Front

What is the diameter of a circle with a radius of 18?

Back

The diameter is 36 (18 multiplied by 2).

Front

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

Back

It is called a radius.

Front

What is the diameter of a circle if the circumference is 31.4?

Back

The diameter is 10 (Circumference = π × diameter, so diameter = Circumference / π).

Front

What is the circumference of a circle with a diameter of 10?

Back

The circumference is approximately 31.4 (C = π × diameter).