Circumference of a Circle

Front

What is the formula to calculate the circumference of a circle?

Back

Circumference = 2 × π × radius or Circumference = π × diameter.

Tags

CCSS.7.G.B.4

Front

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

Back

Diameter = 2 × radius = 10 cm.

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How do you find the circumference of a circle with a known diameter?

Back

Circumference = π × diameter.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 12.5 mm?

Back

78.5 mm.

Tags

CCSS.7.G.B.4

Front

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

Back

Radius = diameter ÷ 2 = 10 ft.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a pizza with a 10-inch diameter?

Back

31.40 inches.

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

If Mia's bike wheels have a diameter of 14 inches, what is the circumference?

Back

43.96 inches.

Tags

CCSS.7.G.B.4

Front

Is the red line in a circle a radius or diameter if it passes through the center and touches two points on the circle?

Back

Diameter.