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

If the radius of a circle is 15 yards, what is the circumference?

Back

94.2 yards (using the formula: Circumference = 2 × π × 15).

Front

What is the distance around a circle called?

Back

Circumference.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

If the diameter of a circle is 20 cm, what is the radius?

Back

10 cm (since radius = diameter / 2).

Front

What is π (pi) approximately equal to?

Back

3.14.

Front

If a circle has a circumference of 50.24, what is the radius?

Back

Approximately 8 (using the formula: radius = circumference / (2 × π)).

Front

What is the circumference of a circle with a diameter of 24 cm?

Back

75.4 cm (using the formula: Circumference = π × diameter).

Front

Is the red line a radius or diameter of the circle if it connects the center to the edge?

Back

Radius.

Front

What is the circumference of a circle with a radius of 12 cm?

Back

75.4 cm (using the formula: Circumference = 2 × π × 12).