Radius and Diameter

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

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

If the radius of a circle is 5 cm, what is the diameter?

Back

The diameter is 10 cm (diameter = 2 x radius).

Tags

CCSS.7.G.B.4

Front

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

Back

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

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

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 circumference of a circle using the radius?

Back

Circumference = 2 x π x radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for 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 area of a circle using the diameter?

Back

Area = (π/4) x diameter².

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 12 inches, what is its radius?

Back

The radius is 6 inches.

Tags

CCSS.7.G.B.4