Radius and Diameter

Front

What is the definition of 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 definition of 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 calculate the radius from the diameter, divide the diameter by 2.

Tags

CCSS.7.G.B.4

Front

How do you calculate the diameter from the radius?

Back

To calculate the diameter from the radius, multiply the radius by 2.

Tags

CCSS.7.G.B.4

Front

If the diameter of a circle is 100 m, what is the radius?

Back

The radius is 50 m.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 10 cm, what is the diameter?

Back

The diameter is 20 cm.

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is given by the formula C = π × diameter or C = 2π × radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

The area (A) of a circle is given by the formula A = π × radius².

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 5 in, what is its diameter?

Back

The diameter is 10 in.

Tags

CCSS.7.G.B.4