How do I can calculate view zenith angle and view azimuth angle of AVNIR-2 sensor?

this term is often confused with angle of field and field of view. The angle of view is the (diagonal) angle subtended by the scene captured in the photograph. This establishes the disc of best...

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The definition of a right angle is an angle measuring 90 degrees. You don't have to calculate anything.

type the value of sine in the calculator and press 2ND SIN for sin-1, or press 2ND SIN for sin-1 and type the value of sine, because sin x = y x = sin-1 y

That depends what you mean with "other angles". For example, if you are considering a triangle, the sum of all angles must be 180 degrees.