From lines that are not parallel.
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Greek: "poly-" from polus, meaning many. "gon" from gonia, meaning angle. Hence, many angles and implicitly many sides.
Some shapes have angles and so they are important in defining the shapes. And angles are absolutely critical for angles. They are the very essence of their existence: if it were not for angles then there would be no angles.
Yes, congruent angles are angles that have the same measure.
using protactor, we use to draw angles in anticlockwise direction and that angles are called positive quadrant angles. and angles in clockwise direction, these angles are called negative quadrant angles.
4 right angles, no other angles.