They are measures of angular displacement. In two dimensional space they may be measured in degrees (by beginners) or in radians. There are 2*pi radians in a revolution.
In 3-d space angles are measured in steradians. A sphere measures 4*pi steradians
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They are congruent.
they have edges and corners and angles and a face :)
180 ANGLES
4 corners 4 angles Angles add up to 90' All angles are right angles Has 4 lines of symmetry
They're all unequal.