SME
Grade 8 Math
Translations, rotations, reflections and dilations
The main lesson, then each kind of problem it solves.
Translations, rotations, reflections and dilations
Main lesson
Reflection
Use this for “(3, 7) is reflected over the y-axis. Where is its image?”
Reflection over a horizontal line
Use this for “(3, 7) is reflected over the x-axis. Where is its image?”
Rotation about the origin
Use this for “Rotate (3, 1) by 90° counterclockwise about (0, 0).”
Dilation
Use this for “Dilate (1, 1) from the origin by a scale factor of 3.”
Similar triangles
Use this for “Two triangles are similar. One has sides 8, 12 and x; the matching sides of the other are 6, y and 12. Find x and y.”
Which move?
Use this for “Is it a flip, a slide or a turn?”
Congruent, similar or neither?
Use this for “Which figures are congruent to the first? Which are only similar?”