Assign each characteristic to the appropriate type of muscle

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.

When only separate discreet points are graphed it is called?

Triangle xyz has vertices x(1,3), y(0,0)