This document contains notes from a geometry class on reflections. It includes the definitions of a line of reflection and the coordinate rules for reflecting points across the x-axis, y-axis, lines y=x and y=-x. It also states that a reflection is an isometry and provides the reflection matrices used to calculate the reflected image of a point by multiplying the matrix and the coordinates of the pre-image point. The document records the student working through homework problems on reflections.