dragonrider
New member
- Joined
- Oct 12, 2014
- Messages
- 18
"In the figure above, lines AC and BD are diameters of the circle, which has a radius of 9. What is the sum of the lengths of arcs AB and CD?"
(I cannot find the pi symbol so I will just use the word)
a. 2pi
b. 3pi
c. 4pi
d. 6pi
e. 8pi
I know that angle BEC is also 140 degress, which makes angles BEA and CED 40 degress, and that means arcs AB and CD are also 40 degrees. How do I find their lengths?