Question

the diagram shows a triangle.
what is the value of u?
u = \square^\circ

Explanation:

Step1: Sum triangle interior angles

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

Step2: Set up angle equation

$4u + 60 + 84 = 180$

Step3: Simplify the left side

$4u + 144 = 180$

Step4: Isolate the term with $u$

$4u = 180 - 144$
$4u = 36$

Step5: Solve for $u$

$u = \frac{36}{4}$

Answer:

$u = 9$