haas_mba07 wrote:

In the circle below, PQ is parallel to diameter OR and OR has length 18. What is the length of the minor arc PQ?

A. 2pi

B. 9pi/4

C. 7pi/2

D. 9pi/2

E. 3pi

I think its A...2 Pi

lenghth of arc PQ = circumference of the semicircle - (length of arc OP+Length of arc QR)

Circum ference = 2pir/2 = 9pi

arc OP= 35/360 (2pi18) since lines are parallel angle ORP = angle ROQ

arc QR= 35/360 (2pi18) (we should use the diameter as the radius here to find the lengths of the arcs)

hence length of arc PQ= 9pi- 2(35pi/10) = 2pi

Please give the OA