Circles Assessment: Zearn Mission 3

r = 8cm. What is the diameter?

• 10

• 4

• 8

• 16

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

The radius is 8 inches. What is the circumference?

• 25.12 inches

• 50.24 inches

• 12.56 inches

• 200.96 inches

What is circumference?

• A line from side to side passing through the center.

• The distance around a circle.

• A line from the center to the side.

• The space inside the circle.

How do you find the radius?

• I do not know

• d/2

• π*r

• π*2

What is the radius of the circle in the image?

• 3

• 2

• 6

• 12

What does π equal?

• 3.2

• 3.14

• 21/7

• 3

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

• c = 15 π

• c = 15

• c = 15 ÷ π

• C = 2π15

Find the area of a circle with radius 7.

• 153.86

• 307.72

• 87.82

• 43.96

What is the area of a circle with diameter 38 cm?

• 1267.09

• 8322.13

• 1133.54

• 4536.46