Radius, Diameter, Circumference Review

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

What is the diameter of a circle?

Back

The diameter 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 diameter if you know the radius?

Back

Diameter = 2 x Radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 x π x Radius or Circumference = π x Diameter.

Tags

CCSS.7.G.B.4

Front

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

Back

20 ft.

Tags

CCSS.7.G.B.4

Front

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

Back

12 in.

Tags

CCSS.7.G.B.4

Front

What is π (pi) approximately equal to?

Back

π is approximately equal to 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

If a circle has a circumference of 31.4 in, what is its radius?

Back

Radius = Circumference / (2 x π) = 5 in.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and circumference?

Back

The circumference is π times the diameter.

Tags

CCSS.7.G.B.4

Front

If the diameter of a circle is 4 ft, what is the circumference?

Back

Circumference = π x 4 ft ≈ 12.56 ft.

Tags

CCSS.7.G.B.4