Assuming you are given a picture of intersecting lines.
Switch the reasons for b) and c) b) the angles form a linear pair , from the picture, so this is linear pair postulate C) Then the measures add to 180, because they are supplementary. Defn of supplementary. E) you have divided both sides of the equation by 2; or multiplied by 1/2; multiplication property of equality F) definition of right angle G) definition of perpendicular
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Since the triangle has equal sides it will carry onto it self at 120, since it can rotate 360 grades only and it has 3 sides so it will rotate in one third of 360 so 120
