Question

1. find the missing angle y.

triangle with angles y, 80°, 39°
options: 70°, 80°, 61°, 90°

Explanation:

Step1: Recall triangle angle sum rule

The sum of angles in a triangle is $180^\circ$.

Step2: Sum the known angles

$80^\circ + 39^\circ = 119^\circ$

Step3: Calculate missing angle y

$y = 180^\circ - 119^\circ$

Answer:

C. $61^\circ$