So let's first think about this first region. Well, that's going to be the definite integral from x is equal to 0 to x is equal to 1, and our upper function is square root of x, so square root of x, and then from that we want to subtract our lower function, square root of x minus x squared over 4 minus 1. So minus x squared over 4 minus 1. And then, of course, we have our dx. So this right over here, this is describing the area in yellow, and you can imagine it that this part right over here, the difference between these two functions, is essentially this height, we'll do it in a different color, is essentially this height, this height, and then you multiply it times dx, you get a little rectangle with width dx, and then you do that for each x, each x you get a different rectangle, and then you sum them all up, and you take the limit as your change in x approaches 0, so you get ultra, ultra thin rectangles, and you have an infinite number of them. And that's our definition, the Riemann definition of what a definite integral is. And so this is the area of the left region, and by the exact same logic, we can figure out the area of the right region.