Question

calculating and justifying angle measures
the measure of \\( \angle x a r \\) can be calculated.
\\( m \angle x a r = \\) 。

Explanation:

Step1: Calculate the angle

Since the right - angle is \(90^{\circ}\) and the given angle is \(20^{\circ}\), we use the formula for the sum of angles in a right - angle.
\(m\angle XAR=90^{\circ}+20^{\circ}\)

Answer:

\(110\)