12. Show that the sum of all the angles formed on the same side of a line at a given point on the
line is 180°
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Given :- AOB is a straight line and rays OC , OD and OE stand on it , forming Angle AOC , Angle COD and DOE and And Angle EOB. Proof :- Ray OC stands on line AB. Hence, The sum of all the angles formed on the same side of a line AB at a point O on it is 180°.
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