1
Q
line of symmetry
A
a line that can divide a polygon into two equal parts
2
Q
reflections in the coordinate plane
A
across the x-axis: (x, y) - (x, -y)
across the y-axis: (x, y) - (-x, y)
across the line y=x: (x, y) - (y, x)
3
Q
translations
A
(x, y) - (x +a, y+ b)
4
Q
Rotations
A
90 degrees about the origin: (x, y) - (-y, x)
180 degrees about the origin: (x, y) - (-x, -y)
270 degrees about the origin: (x, y) - (y, -x)
5
Q
composition of transformations
A
one transformation followed by another
6
Q
glide reflection
A
the composition of a translation and a reflection across a line parallel to the translation vector.
