Understanding Circumference of a Circle

What is the circumference of a circle?

• The boundary of the circle

• The diameter of the circle

• The area inside the circle

• The radius of the circle

Which formula is used to calculate the circumference of a circle?

• C = Pi * D

• C = 2 * R

• C = Pi * R^2

• C = 2 * Pi * R

What is the approximate value of Pi used in circumference calculations?

• 3.00

• 2.71

• 3.14

• 1.62

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

• 20 cm

• 10 cm

• 5 cm

• 15 cm

Using a diameter of 10 cm, what is the circumference of the circle?

• 20 cm

• 62.8 cm

• 15.7 cm

• 31.4 cm