Given OPQRS and S = 40°, what is the measure of ZR? S
R
40°
Р
A. 140°
O B. 135°
C. 90°
O D. 105°
E. 40°
O F. Cannot be determined
HELP ASAP

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

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