area and circumference - sana

What does "circumference" mean?

• Space a circle takes up
• Distance around a circle
• Line from one side of a circle to another
• Line from center of circle to side

Tags

CCSS.7.G.B.4

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

• c = 15π

• C = 2π15

• c = 15 ÷ π

• c = 15+π

what is the area of this semicircle ?

• 22 cm²

• 154 cm²

• 44 cm²

• none of the above

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.

Tags

CCSS.7.G.B.4

CCSS.7.G.B.6

The perimeter of a circle is usually called the...

• radius
• diameter
• circumference
• area

Tags

CCSS.7.G.B.4

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

• 31.25 m²
• 29.55 m²
• 30.36 m²
• 28.26 m²

Tags

CCSS.7.G.B.4

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

• Area
• Circumference
• Neither

Tags

CCSS.7.G.B.4

Jake's cow is tied to a beanstalk with a piece of rope that is 15ft long. What is the area of the circle in which the cow can graze?

• 47.1 ft.
• 176.7 ft²
• 706.9 ft²
• 94.2 ft

Tags

CCSS.7.G.B.4

Alex calculated the area of his circular Frisbee that has a radius of 6 cm and got an answer of 37.68 cm sq. What mistake do you think he has made? (take  $\pi$  = 3.14) Select all options that may apply.

• He has made no mistake

• He has used A= $\pi\times r\times2$  

• He has used A= $\pi d$  

• He thinks  $r\times r$  is the same as  $r+r$  

Select all the formulas that can be used to calculate the area of a circle:

• $\pi$ rr

• $\pi$ d

• 2r $\pi$

• $\pi r^2$

• $\pi r2$