Diameter and Radius

Front

What is the diameter of a circle?

Back

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

Tags

CCSS.HSG.C.A.2

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

If the radius of a circle is 4 mm, what is the diameter?

Back

The diameter is 8 mm (diameter = 2 x radius).

Tags

CCSS.7.G.B.4

Front

If the diameter of a circle is 20 ft, what is the radius?

Back

The radius is 10 ft (radius = diameter / 2).

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The diameter is always twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

How do you calculate the circumference of a circle using the diameter?

Back

Circumference = π x diameter.

Tags

CCSS.7.G.B.4

Front

How do you calculate the area of a circle using the radius?

Back

Area = π x radius².

Tags

CCSS.7.G.B.4

Front

What is the formula for the diameter in terms of circumference?

Back

Diameter = Circumference / π.

Tags

CCSS.7.G.B.4

Front

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

Back

Radius = √(Area / π).

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 40 ft, what is its radius?

Back

The radius is 20 ft.

Tags

CCSS.7.G.B.4