What is ordered pair​

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.

What is not true about kl and mn? what is mn? (show your work)

Identify the parent function that can be used to graph the function f(x)=3(x-9)2