I’m confused on number two. i feel like i’m doing it wrong and idk where to get f2 from

How many different triangles can be constructed with the angle measurements of 134° 10° and 36° ?

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.

Which equation represents h for right triangle abc