#380 from

OG 10th Ed

In the circle below,

PQ is parallel to diameter

OR, and

OR has length 18. What is the length of minor arc

PQ?

I need help with understanding one thing. In the answer explanation it says that "since the measure of inscribed angle

PRO is 35 degrees, the measure of minor arc

OP is 70 degrees." Can somebody explain to me how that is figured out? In other words, how do you figure out the 70 degrees by knowing that

PRO is 35 degrees??

P.S. Sorry about my drawing skills...

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