13.1 Translations and Rotations
Def. Translations—a motion of the plane that moves every point of the plane a specified distance in a specified direction along a straight line.
Properties of Translations
Constructions of Translations
1) Dot paper
2) Coordinate axes
Find the coordinates of the image of quadrilateral ABCD in Figure under the translation in parts a-c. Draw the image in each case.
Half-turn—rotation of 180°
Def. Rotation—a transformation of the plane determined by holding one point –the center—fixed and rotating the plane about this point by a certain amount in a certain direction.
Example –rotate counter-clockwise 90° about O