Circle Basics

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

• $C=\pi\cdot15$
  

• $C=2\pi\cdot15$
  

• $C=\frac{15}{\pi}$
  

• $C=\pi\cdot15^2$
  

Tags

CCSS.7.G.B.4

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

• Radius
• Diameter

Find the area of the circle

• 43.96
• 153.86
• 87.82
• 307.72

Tags

CCSS.7.G.B.4

The radius is 8 inches.  What is the circumference?

• 50.24 inches
• 25.12 inches
• 12.56 inches
• 200.96 inches

Tags

CCSS.7.G.B.4

What is circumference?

• The distance around a circle.
• The space inside the circle.
• A line from side to side passing through the center.
• A line from the center to the side.

What is the area of a circle?

• The distance around a circle.
• The space inside the circle.
• A line from side to side passing through the center.
• A line from the center to the side.

What is the diameter of the circle in the image?

• 10

• 20π

• 20

• 100

Tags

CCSS.7.G.B.4

What does π equal?

• 3

• 3.14

• 3.2

• 21/7

Tags

CCSS.HSG.GMD.A.1

A diameter is also a chord. 

• True
• False 

Tags

CCSS.HSG.C.A.2

Name the pictured part of the circle.

• Radius

• Central Angle

• Sector

• Center

• Arc