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.

Tags

CCSS.HSG.C.A.2

Front

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

Back

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

Tags

CCSS.7.G.B.4

Front

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

Back

The diameter is 36 (2 * 18).

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

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

Back

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

Tags

CCSS.7.G.B.4

Front

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

Back

Circumference = 2 * π * Radius.

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π * Radius^2.

Tags

CCSS.7.G.B.4

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.