Circumference

Circumference

What is a Circle?

Parts of a Circle

Center
Radius (distance from center to a point on the circle)
Diameter (distance from a point on the circle through the center to another point on the circle)

 $Diameter\ =\ 2\times Radius$  
 $Radius=Diameter\div2$  

Multiple Choice

12 inches in this circle represents its

• radius

• diameter

Multiple Choice

14cm in the circle represents its

• radius

• diameter

Fill in the Blanks

Fill in the Blanks

Finding Circumference given radius

 $C=2\pi r$  
 $C=2\times3.14\times12$  
 $C=75.36\ ft$  

Finding Circumference given diameter

 $C=\pi d$  
 $C=3.14\times14$  
 $C=43.96\ cm$  

Multiple Choice

Find the circumference of the circle

• 50.24 yd

• 25.12 yd

• 11.14 yd

Multiple Choice

Find the circumference of the circle

• 18.84 cm

• 75.36 cm

• 37.68 cm

Multiple Choice

Find the circumference of the circle whose radius is 4 in

• 12.56 in

• 25.12 in

• 50.24 in

Multiple Choice

Find the circumference of the circle whose diameter is 10 m

• 31.4 m

• 62.8 m

• 15.7 m

Circumference

Now go onto slide 6 and complete today's assignment.

If you have questions, ask for help!