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.

Front

What is the relationship between radius and diameter?

Back

Diameter is twice the radius. (Diameter = 2 × radius)

Front

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

Back

10 ft.

Front

If the diameter of a circle is 12 ft, what is the radius?

Back

6 ft.

Front

What is π (pi) approximately equal to?

Back

Approximately 3.14.

Front

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

Back

Circumference = π × diameter.

Front

What is the circumference of a circle with a radius of 7 ft?

Back

Circumference = 2 × π × 7 ≈ 43.96 ft.

Front

What is the diameter of a circle with a radius of 3 ft?

Back

6 ft.

Front

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

Back

Radius = Circumference / (2 × π) ≈ 5 ft.

Front

What is the term for a line segment that connects the center of a circle to any point on its circumference?

Back

Radius.