Radius and Diameter

Front

What is the radius of a circle?

Back

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

Front

What is the diameter of a circle?

Back

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

Tags

CCSS.HSG.C.A.2

Front

How do you calculate the radius from the diameter?

Back

To find the radius, divide the diameter by 2.

Tags

CCSS.7.G.B.4

Front

How do you calculate the diameter from the radius?

Back

To find the diameter, multiply the radius by 2.

Tags

CCSS.7.G.B.4

Front

If the diameter of a circle is 70 m, what is the radius?

Back

35 m

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 24 m, what is the diameter?

Back

48 m

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

What is the formula for the circumference of a circle?

Back

The circumference (C) is calculated as C = π × diameter or C = 2 × π × radius.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

The area (A) is calculated as A = π × radius².

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 6 m, what is its area?

Back

The area is 36π m².

Tags

CCSS.7.G.B.4