A standard sheet of paper has a right angle at each corner.
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Basically its just where you position the views of the main object, in first angle projection, if you view the object from the left, the view is drawn to the right of the object, in third angle projection, its drawn on the viewing side.
You can, any right angle shaped object (that is breakable) can be used like a wishbone.
Perpendicular Force is the forces that acts at right angle to the object.
Shadow of a building have right angles at the base of the building. Braces of buildings have right angles.
Because a right angle is a right angle.