How many 1/3 makes 1/2

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.

Can (3,5 and square root 34) be sides on a right triangle?

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)