Dear All
Please solve these all symmetry questions

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.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

What is the slope of the line that contains the points (-2,1) and (0,-3)