Seventy-eight times n is at least 312. write your solution in interval notation

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 someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?