You could
measure it using a protractor,
derive it from basic geometric properties (for example angles of a regular polygon), or
calculate it using trigonometry.
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If it is a scalene triangle then: 180 - the sum of the 2 known angles = x angle
Angle a, by itself has no value. You must first assign a value to a to get the value of tan a.
You measure it. An interior angle of an ordinary polygon can have any value in the range (0, 360) degrees excluding 180 degrees. There is no constraint on the size of a single angle.
The inverse cos of 1 is equal to o degrees. You can find this answer by knowing what angle measurement has cos equal to a value of 1.
A trapezoid should add up to 360 degrees. add the angles that are shown and subtract by 360. the missing angle should be found.