Question

solve for c.
120°
64°
c = ?°

Explanation:

Step1: Identify supplementary angle

The 120° angle and the adjacent angle in the triangle are supplementary.
$180^\circ - 120^\circ = 60^\circ$

Step2: Sum of triangle angles is 180°

Let the unknown angle be $c$.
$c + 64^\circ + 60^\circ = 180^\circ$
$c = 180^\circ - 64^\circ - 60^\circ = 56^\circ$

Answer:

56