Circles

The distance across a circle through the center is called the_______________. (circle is cut in half)

• radius

• circumference

• diameter

• radius

The radius is....

• a line from the center point to the edge of the circle

• an element in science

• a line that goes all the way through a circle

• a line that crosses through the center and touches each edge

What is the diameter?

• 8 cm

• 16 cm

• 10 cm

• 4 cm

If the diameter of a circle is 14.5 cm, then what is the radius?

• 29 cm

• 7.5 cm

• 7.25 cm

• 28 cm

If r = 4, then d = ________

• 2

• 8

• 4

• 16

A segment between two points on a circle is called a _______________.

• chord

• central angle

• ray

• diameter

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the area in square meters of glass is the window made of?

• 31.25 m²

• 29.55 m²

• 28.26 m²

• 30.36 m²

If you are going to paint the entire circle in the center of a basketball court, do you need to know the area or circumference of the circle?

• Area

• Circumference

• Neither

Circle A has a circumference of 36π meters. What is the radius of Circle A?

• 2 meters

• 6 meters

• 12 meters

• 18 meters

The circle above has a radius of 3 cm. What is the area of the circle?

Use = 3.14.

• 9.42 cm²

• 18.84 cm²

• 28.26 cm²

• 56.52 cm²