Question

what is $mangle1$?
$mangle1=square^{circ}$

Explanation:

Step1: Find the adjacent angle of \(141^{\circ}\)

The adjacent angle of \(141^{\circ}\) is \(180 - 141=39^{\circ}\) (linear - pair angles sum to \(180^{\circ}\)).

Step2: Use the triangle - angle sum property

In a triangle, the sum of interior angles is \(180^{\circ}\). Let \(\angle1=x\). Then \(x + 39+50 = 180\).

$$x=180-(39 + 50)$$

$$x=180 - 89$$

Answer:

\(91\)