Here is a diagram of 2.
2. In the part of the circle that lies in the 1st quadrant, the point P9x,y) is on the circle with centre at the origin ). M is on the x-axis at x = 2 and N is on the y-axis at y=1. The size of angle MOP is x radians. How exactly do I find the area of the quadrilateral OMPN so that it is A = 4sinx + 2cosx???