Angles are usually measured in degrees. They can also be measured in radians.
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Angle a, by itself has no value. You must first assign a value to a to get the value of tan a.
The angle can have any value.
A supplementary angle can have any value - depending on the first angle.
Complementary angles are angles whose sum is 90° . Consequently, the value of any one angle can be any number less than 90°. The value of the second angle is the difference between 90 and the value of the first angle.
the angle with a value from 90 degree-180 degree