Circumference of a circle

1) The perimeter of a circle is called

• Area of a circle

• Circumference of a circle

• Diameter of a circle

• Center of a circle

2) The circumference of a circle means

• the distance around a circle.

• the distance across a circle through its center.

• the distance across the circle to its edges.

• the distance around a center.

3) Pi is the ratio of a circle's................ to it's ....................

• area ; diameter

• radius; diameter

• area; circumference

• circumference; diameter

4) If a circle has a radius of 5 cm, what is the diameter?

• 2.5 cm

• 10 cm

• 5 cm

• 3 cm

5) Find the circumference of the following circle. Use π=3.142

• 15.7 cm

• 31.4 cm

• 3.1 cm

• 78.6 cm

6) What is the radius of a circle, if the diameter is 20 m?

• 10 m

• 20 m

• 5 m

• 40 m

7) What is the diameter of a circle, if the radius is 12 cm?

• 24 cm

• 144 cm

• 6 cm

• 37.7 cm

8) Find the circumference of a circle with a diameter of 9 m.

• 20.3 m

• 28.3 m

• 283 m

• 28.6 m

9) What is the circumference of the following Pizza if the radius is 10 cm.

• 6.28 cm

• 6280 cm

• 628 cm

• 62.8 cm

10) Find the circumference of the CD, if the diameter is 12 cm.

• 37.7 cm

• 37.6 cm

• 376 cm

• 75.4 cm