Unit 3 - Rigid Motions - Reflections Flashcards
1
Q
Definition of Reflection
A
“Flip” over a line of reflection
2
Q
How do you know if something is a reflection? (3)
A
- Pre - image and image
- Are equidistant
- From the line of reflection
3
Q
Formula for Reflection over X - Axis
A
(x, -y)
4
Q
Formula for Reflection over Y - Axis
A
(-x,y)
5
Q
Formula for Reflection of y = x
A
(y,x)
6
Q
Reflection in y = -x
A
(-y,-x)
7
Q
Is angle measure, distance and orientation preserved in a reflection
A
Angle Measure: Yes
Distance: Yes
Orientation: No
8
Q
Is a reflection a rigid motion and why?
A
It’s a rigid motion because both distance and angle measure is preserved
