Radius and Diameter

Front

What is the definition of radius?

Back

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

Front

What is the definition of diameter?

Back

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

Front

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

Back

The diameter can be calculated using the formula: Diameter = 2 * Radius.

Front

If the radius of a circle is 18, what is the diameter?

Back

The diameter is 36 (2 * 18).

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

If a circle has a diameter of 80 ft, what is the radius?

Back

The radius is 40 ft (80 ft / 2).

Front

What is the formula for the circumference of a circle in terms of radius?

Back

Circumference = 2 * π * Radius.

Front

What is the formula for the area of a circle in terms of radius?

Back

Area = π * Radius^2.

Front

Is the red line a radius or diameter if it connects the center of the circle to the edge?

Back

It is a radius.

Front

Is the red line a radius or diameter if it connects two points on the circumference and passes through the center?

Back

It is a diameter.