1. 11.3 Reflections
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2. Reflection
A transformation in which a figure is flipped over a line, called the line of reflection
Creates a mirror image of the original figure
New figure is marked with primes

3. Example 1 What will this shape look like when reflected in:
the x axis?
the y axis?
the x axis and then
the y axis and then

4. Reflecting Points Across Axes
To reflect a figure in the x axis, take the opposite of the y coordinate.
(x, y) becomes (x, -y)
To reflect a figure in the y axis, take the opposite of the x coordinate.
(x, y) becomes (-x, y)

5. Example 2
If the vertices of a triangle are A (-1,1), B (-1, 3), and C (6,3) and it’s reflected across the y axis, what are the coordinates of A′ , B′ , and C′ ?