Circumference of a Circle

Front

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

Back

Circumference = π × Diameter (C = πd) or Circumference = 2 × π × Radius (C = 2πr)

Tags

CCSS.7.G.B.4

Front

What does the term 'circumference' refer to?

Back

The distance around the edge of a circle.

Front

If a circle has a diameter of 10 feet, what is its circumference?

Back

31.4 feet (using π ≈ 3.14)

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle?

Back

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

Tags

CCSS.HSG.C.A.2

Front

If the radius of a circle is 7 feet, what is the circumference?

Back

43.96 feet (using C = 2πr, where π ≈ 3.14)

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (Diameter = 2 × Radius).

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How do you find the radius if you know the circumference?

Back

Radius = Circumference / (2π).

Tags

CCSS.7.G.B.4

Front

What is a chord in a circle?

Back

A line segment with both endpoints on the circle.

Front

What is the area of a circle?

Back

Area = π × Radius².

Tags

CCSS.7.G.B.4