Circumference of a Circle - Updated 121323

Front

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

Back

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

Front

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

Back

20 ft.

Front

What is the radius of a circle?

Back

The radius is half the diameter.

Front

How do you find the radius if you are given the diameter?

Back

Divide the diameter by 2.

Front

What is the circumference of a circle with a diameter of 3.5 ft?

Back

10.99 ft.

Front

If the diameter of a circle is 8 ft, what is the radius?

Back

4 ft.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius.

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14.

Front

If the circumference of a circle is 31.4 ft, what is the diameter?

Back

10 ft.

Front

How do you calculate the circumference using the radius?

Back

Circumference = 2 × π × radius.