Question

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

Explanation:

Step1: Analyze the given angles

We know that there is a right - angle (90°) and two 20° angles.

Step2: Calculate \(m\angle CAD\)

We use the formula \(m\angle CAD=90^{\circ}-20^{\circ}-20^{\circ}\).

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Answer:

\(50\)