Area and Circumference

What number represents π?

• 3.14

• 2.71

• 1.62

• 4.20

What is the circumference of a circle with a diameter of 10 cm?

• 25.0 cm

• 31.4 cm

• 35.0 cm

• 20.0 cm

Find the circumference of a circle with a radius of 5 cm.

• 25.0 cm

• 31.4 cm

• 15.7 cm

• 20.0 cm

If the radius of a circle is 7 cm, what is the diameter?

• 10 cm

• 12 cm

• 14 cm

• 16 cm

What is the area of a circle with a radius of 3 cm?

• 28.26 cm² (Area = πr²)

• 27.00 cm² (Area = πr²)

• 31.42 cm² (Area = πr²)

• 25.12 cm² (Area = πr²)

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

• 5 cm

• 7 cm

• 10 cm

• 12 cm

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

• C = 2πd

• C = πd

• C = d²π

• C = π/2 * d

If the circumference of a circle is 31.4 cm, what is the radius?

• 3 cm

• 4 cm

• 5 cm

• 6 cm

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

• 62.8 cm

• 50 cm

• 40 cm

• 70 cm

What is the formula for the circumference of a circle?

• C = πr^2

• C = 2πr

• C = πd^2

• C = 4πr