Area, Circumference, and Sectors

What is the exact area of this circle?

Recall: $A=\pi r^2$  and  $C=2\pi r$  

• 1444π cm²

• 361π cm²

• 38π cm²

• 76π cm²

A Circle has a radius of 4. What is the circumference of the circle? 
Recall:   $A=\pi r^2$  and  $C=2\pi r$  

• 4π 

• 16π 

• 2π 

• 8π 

A Circle has a radius of 4. What is the area of the circle?  Recall:   $A=\pi r^2$  and  $C=2\pi r$  

• 4π

• 16π

• 2π

• 8π

A Circle has a radius of 6 inches. What is the circumference of the circle?
Recall: $A=\pi r^2$  and  $C=2\pi r$  

• 3π in

• 6π in

• 12π in

• 36π in 

 A Circle has a radius of 6 inches. What is the area of the circle? 
Recall:  $A=\pi r^2$   and   $C=2\pi r$  

• 3π in2

• 6π in2

• 12π in2

• 36π in2

A Circle has a diameter of 10 centimeters. What is the area of the circle?

Recall: $A=\pi r^2$  and  $C=2\pi r$  

•  $5\pi\ cm^2$  

•  $10\pi\ cm^2$  

•  $25\pi\ cm^2$  

•  $100\pi\ cm^2$  

A Circle has a diameter of 18 meters. What is the area of the circle? 

Recall:   $A=\pi r^2$  and  $C=2\pi r$  

• 9π m²

• 18π m²

• 81π m²

• 324π m²

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

The area of a circle is  $25\pi$ .  What is the radius?
Recall:  $A=\pi r^2$  and  $C=2\pi r$  

• 25

• 10

• 5

• 625

The area of a circle is  $64\pi$ .  What is the radius?
Recall:  $A=\pi r^2$  and  $C=2\pi r$  

• 64

• 16

• 8

• 32