Circumference

Front

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

Back

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

Front

If the radius of a circle is 12.5 mm, what is its circumference?

Back

78.5 mm.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

If the diameter of a circle is 19 inches, what is the radius?

Back

9.5 inches.

Front

What is the circumference of a circle with a radius of 27 yards?

Back

169.56 yards.

Front

How do you convert radius to diameter?

Back

Multiply the radius by 2.

Front

What is the circumference of a circle with a radius of 10 ft?

Back

62.8 ft.

Front

If a circular garden has a circumference of 392.5 ft, what is its radius?

Back

62.5 ft.

Front

What is π (pi) approximately equal to?

Back

3.14.

Front

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

Back

Use the formula Circumference = π × diameter.