Chapter 4.2, Problem 47E

The area, A, of a semicircle of radius r is given by $A=\frac{1}{2}\pi r^2$. Using this equation, compare the answer to Exercises 47 and 48 with the exact area.

Approximated the area under the graph of $f\left(x\right)=\sqrt{25-x^2}$ using 10 rectangles.