Question

1. if all angles of a triangle add up to 180°, what is the missing angle? x° 67° 56°

Explanation:

Step1: Set up the equation

$x + 67+56=180$

Step2: Simplify the left - hand side

$x + 123 = 180$

Step3: Solve for x

$x=180 - 123$
$x = 57$

Answer:

$57^{\circ}$