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A parallelogram has four sides. All four sided figures have a sum of the interior angle measures equal to 360°.
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4 angles and 4 sides .................. side 1......................... ............ ____________................. ............/..................... /................. side 3./....................../..side 2....... ........./ ...................../.................... ......../___________/..................... ..................................................... .................side 4........................... ..................................................... ..................................................... ....angle 1 ____________angle 2 .............. /....................../............. ............../....................../ ............. ............./....................../............... angle 3/___________/angle 4..... ..................................................... .....................................................
this is used in trigonometry. its means angle side angleothers include ssa (side side angle), saa (side angle angle), ssa (side side angle), sas (side angle side), sss (side side side), aaa (angle angle angle)
The exact angle at which the beam and wave strike the surface is the same angle at which they are reflected.