Question

what fraction of a turn is this angle?
$\frac{3}{4}$ turn
$\frac{1}{2}$ turn
$\frac{1}{4}$ turn
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Explanation:

Step1: Recall a full turn angle

A full turn is $360^\circ$, and a straight angle (formed by two opposite rays) is $180^\circ$.

Step2: Calculate the fraction of the turn

To find the fraction of a turn, we divide the angle of the given figure (which is a straight angle, $180^\circ$) by the total angle in a full turn ($360^\circ$). So the fraction is $\frac{180^\circ}{360^\circ}=\frac{1}{2}$.

Answer:

$\frac{1}{2}$ turn (corresponding to the option with $\frac{1}{2}$ turn)