Answer
Domain = {0, $\frac{1}{2}$}
Range = {$\frac{1}{4}$, $\frac{7}{8}$, $\pi$}
This relation is not a function
Work Step by Step
Domain = set of all the first elements of the ordered pairs
Range = set of all the second elements of the ordered pairs
$\frac{1}{2}$ appears as a first element twice; thus, this relation is not a function