Chapter 11.6, Problem 62PE

For Exercises 61-62, describe the differences in the graphs of C1 through C3.
$C_1:x=\mathrm{t}$ and $y=\sqrt{25-t^2}$
$C_1:x=e^t$ and $y=\sqrt{25-e^{2t}}$
$C_1:x=\cos t$ and $y=\sqrt{25-{\cos }^{2}t}$