Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
2. Reflections
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Exercise 20 Page 557

A glide reflection is a transformation involving a translation followed by a reflection.

Practice makes perfect

To complete a glide reflection, we first perform the translation and then the reflection.

Translation

Let's begin by drawing â–ł RST.

The given rule of translation represents a vertical translation 2 units up and a horizontal translation 2 units right.

(x,y) → (x+2,y+2) To perform the translation, we have to add 2 to each y- and x-coordinate.

Reflection

To reflect the triangle in the given line, we will reflect its vertices. Recall that if a point (a,b) is reflected on the line y=x, then its image is (b, a). With this, let's reflect each vertex of the triangle. &â–ł R'S'T' && â–ł R''S''T'' &R'(6,3) && R''(3,6) &S'(9,5) && S''(5,9) &T'(8,6) && T''(6,8) Now that we know the reflected vertices, we can plot them and graph the image.

Final Glide Reflection

The final glide reflection is the combined translation and reflection.