Find an equation for each polar graph. Express as a function of $\small{t}$.

$\qquad\qquad\qquad\qquad$(click on graphs to enlarge)
$\quad$ $\qquad$ $\qquad$
$\qquad$ (a) Cardioid $\qquad\quad$ (b) Seven-petal rose $\qquad\quad$ (c) Circle

$\quad\small{r = }$ $\qquad\;\;$ $\small{r = }$ $\qquad\;$ $\small{r = }$