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 circumference of a circle with a diameter of 10 cm?

Back

Circumference = π × diameter = π × 10 cm ≈ 31.4 cm.

Front

What is the diameter of a circle if its circumference is 31.4 cm?

Back

Diameter = Circumference / π ≈ 31.4 cm / π ≈ 10 cm.

Front

What is the relationship between circumference and diameter?

Back

The ratio of circumference to diameter is a constant known as π (pi), approximately 3.14.

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

If the radius of a circle is 5 cm, what is its circumference?

Back

Circumference = 2 × π × 5 cm ≈ 31.4 cm.

Front

What is the term for the distance around a circle?

Back

Circumference.

Front

If a circle has a circumference of 62.8 cm, what is its diameter?

Back

Diameter = Circumference / π ≈ 62.8 cm / π ≈ 20 cm.

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

How do you find the circumference of a circle using the radius?

Back

Circumference = 2 × π × radius.