This super cool analytical geometry question is great for learning and practicing some key concepts in analytic geometry as well as calculus. I don't think this one can be considered insanely hard but it needs you to use and thus review integration as a way to find the areas of certain regions under a function on the coordinate plane. The rules of integral is one of the most advanced topics in maths and one that many of us, including tend to forget over time. In this problem, there is a purple parabola-shaped function curve and a blue right triangle has been placed into it in such a way as to divide the part of the parabola above the X-axis into three regions. And our job is to find the green region that is on right side of the diagram. I found this puzzle to be fun and the solution was smooth and satisfying. You could want to try this yourself. If you do, what you read upto this point contains ample clues to guide you, but if you still can't solve it don't feel bad because I showed the step-by-step solution in the video.