Circumference & Arc length (DL Week 7)

What is the distance around a circle?

• Circumference
• Area
• Diameter
• Radius

Tags

CCSS.HSG.GMD.A.1

The angle made at the center of a circle by the radii of the end points of an arc is called the ________.

• central angle

• minor arc

• major arc

• none of the above

_______ is the length of an arc or a portion of a circle's circumference.

• arc length

• major arc

• minor

• none of the above

What is the Arc Length equation?

•  $ArcLength\ =\ \frac{central\ angle\ measure}{360}\left(2\pi r\right)$  

•  $ArcLength\ =\ \left(2\pi r\right)$  

•  $ArcLength\ =\ \frac{central\ angle\ measure}{180}\left(\pi\right)$  

•  $ArcLength\ =\ \frac{central\ angle\ measure}{180}\left(\pi d\right)$  

Tags

CCSS.HSG.C.B.5

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

Tags

CCSS.7.G.B.4

Daniel wants to buy cookies for her friend. The
radius of a cookie is 5 inches. What is the cookie’s 
circumference?

• 10 in
• 2.5 in
• 15.7 in
• 31.4 in 

Tags

CCSS.7.G.B.4

A circular swimming pool is 21 feet in diameter.
How many feet around is the pool?

• 10.5 ft
• 42 ft
• 65.94 ft
• 131.95 ft

Tags

CCSS.7.G.B.4

Find the arc length of the bolded arc in the picture.

• A
• B
• C
• D

Tags

CCSS.HSG.C.B.5

In circle O, the radius is 4, and the measure of minor arc AB is 120 degrees. Find the length of minor arc AB to the nearest integer.

• 5
• 9
• 8
• 6

Tags

CCSS.HSG.C.B.5

Find the arc length.  Leave your answer in terms of π.

• 7/4π cm
• 7/2π cm
• 1/5π cm
• 45π cm

Tags

CCSS.HSG.C.B.5