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An angle of view in an agular extent of a given scene as imaged by a camera.
Look up the Konica Wai-Wai (17mm angle). Hard to get yes, but not "impossible".
Does. a 90° angle have right angles
It is the alternate angle to the angle of elevation
There are many ways to measure a contact angle, but the simplest way is to use a goniometer. The image of the droplet is taken with a high resolution camera; the angle can then be measured using a protractor.