Question

if $m\angle x = 34^\circ$ and $m\angle z = 26^\circ$, what is $m\angle y$?
$\bigcirc$ $m\angle y = 26^\circ$
$\bigcirc$ $m\angle y = 34^\circ$
$\bigcirc$ $m\angle y = 60^\circ$
$\bigcirc$ $m\angle y = 120^\circ$

Explanation:

Step1: Recall triangle angle sum

Sum of angles in triangle = $180^\circ$

Step2: Calculate $m\angle Y$

$m\angle Y = 180^\circ - 34^\circ - 26^\circ = 120^\circ$

Answer:

D. $m\angle Y = 120^\circ$