Arc Length and Sector Area- Notes

Multiple Select

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

Multiple Choice

The radius of the circle is 9 meters.  What is the circle's circumference?

• 9 meters
• 28.26 meters
• 56.52 meters
• 18 meters

Multiple Choice

FIND THE ARC LENGTH OF THE BOLDED ARC

• A
• B
• C
• D

Multiple Select

Which of the following formulas calculates the arc length of a circle? (Select ALL that apply.)

• $$\frac{\theta}{180}\times2\pi r$$

• $$\frac{\theta}{360}\times2\pi r$$

• $$\frac{\theta}{360}\times\pi d$$

• $$\frac{\theta}{360}\times\pi r^2$$

Multiple Choice

Find the arc length of the circle. (Round your answer to the nearest tenth.)

• 42.4 m

• 21.2 m

• 84.8 m

• 6.7 m