Circle Basics, Circumference and Area

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's approximate circumference?

• 3 m 

• 9.42 m

• 12 m

• 18.84 m

About how long is the circumference of this circle?

• 12 in

• 36 in

• 18 in

• 2 in

The circumference of this circle is 54 meters, approximately how long is the diameter?

• 27 meters

• 3.14 meters

• 9 meters

• 18 meters

Find the circumference of this circle.

*HINT: find the diameter first, then use that to find the circumference

• 3 in

• 12 in

• 37.68 in

• 18.84 in

If my circumference is 163.28ft, what is my radius?

• 52 ft

• 26 ft

• 3.14 ft

• 163.28 ft

The circumference of a circle is 45.53 yd. What is the diameter of that circle?

• 14.5 yd.

• 15.4 yd.

• 13.8 yd.

• 142.96 yd.

The circumference of a circle is 67.89 yd. What is the diameter of that circle?

• 18.9 yd

• 22.7 yd

• 21.62 yd

• 23.8 yd

If you have the circumference of a circle, you can solve the diameter by doing what?

• divide the circumference by 2

• multiply the circumference by 2

• multiply the circumference by pi (3.14)

• divide the circumference by pi (3.14)

The definition of diameter is

• distance from the center of any point on the circle

• distance across the circle through the center

• distance from one point to another

• distance around the circle

what is the formula for finding diameter

• r = 2 d

• d = 2 r

• a = m c²

• c = π 2 r