Circle Area and Circumference

A circle is .....

• the distance from the center to any point on the circle.

• the set of all points in a plan that are the same distance from a point called the center.

• the distance across the circle through the center.

• the center.

What algebraic equation(s) can you use to find the radius? Select all that apply. 

•  $\frac{d}{2}$  

•  $2d$  

•  $.5d$  

•  $\pi d$  

Tags

CCSS.7.G.B.4

What algebraic equation could you use to find the diameter? 

•  $\frac{r}{2}$  

•  $2r$  

•  $\pi r^2$  

•  $2\pi r$  

Tags

CCSS.7.G.B.4

Find the radius.

• 21.6 cm

• 33.9 cm

• 5.4 cm

• 3.44 cm

Tags

CCSS.7.G.B.4

Find the diameter.

• 22 m

• 5.5 m

• 22 yd

• 34.56 m

Tags

CCSS.7.G.B.4

Circumference is the distance around a circle. The ratio of  $\frac{circumference}{diameter}$  is the same for every circle and is represented by ______. 

• C

•  $\pi$  

•  $\Delta$  

• 3

Tags

CCSS.HSG.GMD.A.1

Find the circumference. Use 3.14 for  $\pi$  

• C = 14.44 ft

• C = 7.22 ft

• C = 16.61 ft

• C = 0.84 ft

Tags

CCSS.7.G.B.4

Find the area. Use 3.14 for  $\pi$  

• A = 62.8  $mm^2$  

• A = 31.4  $mm^2$  

• A = 314  $mm^2$  

• A = 20  $mm^2$  

Tags

CCSS.7.G.B.4

The center of a circular garden is at the end of a deck as shown in the diagram. How much area do you have to plant flowers? Use 3.14 for  $\pi$  

• 452.16  $ft^2$  

• 339.12  $ft^2$  

• 113.04  $ft^2$  

• 75.36  $ft^2$  

Tags

CCSS.7.G.B.4

Find the area and circumference. Use 3.14 for  $\pi$  

• A= 706.5 $in^2$  
  C= 15.7 in 

• A= 31.4  $in^2$  
  C= 78.5 in

• A= 314  $in^2$  
  C= 31.4 in 

• A= 78.5  $in^2$  
  C= 31.4 in 

Tags

CCSS.7.G.B.4