Reflections Teacher Twins©2014

Warm Up A (-2, 5) B (3, -7) C (0, 8) D (-5, -2) E (2, 3) F (-3, 0) Graph and label each ordered pair. A (-2, 5) B (3, -7) C (0, 8) D (-5, -2) E (2, 3) F (-3, 0)

Warm Up Answers

Reflections

A reflection is a transformation that produces a mirror image when a shape is reflected across a line.

Triangle ABC is reflected across the y axis. Notice the points are equidistant from the y axis. The new shape has the letter and the apostrophe .

A (- 7, 6) A’ (7, 6) B (- 3, 6) B’ (3, 6) C (- 4, 2) C’ (4, 2) Notice the x value becomes the opposite and the y value stays the same. Reflection across the y axis rule: (x , y) (- x, y)

Triangle ABC is reflected across the x axis. Notice the points are equidistant from the x axis. The new shape has the letter and the apostrophe .

A (- 7, 6) A’ (-7, -6) B (- 3, 6) B’ (-3, -6) C (- 4, 2) C’ (-4, -2) Notice the y value becomes the opposite and the x value stays the same. Reflection across the x axis rule: (x , y) (x, - y)

Practice Triangle ABC A(0,7), B(-2, 5), C(4, -3) Reflect triangle ABC across the y axis. Reflect triangle ABC across the x axis.

Closure Write the ordered pairs for A(2,6), B(-7,0), and C(3,-2) if the points are reflected across the x axis.