Wsg help me with this

What is the orthocenter and what is it used in geometry

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.

Meg constructed triangle poq and then used a compass and straightedge to accurately construct line segment os, as shown in the figure below, which could be the measures of angles pos and angle poq?