Geometry Unit 9 Flashcards
What is a transformation?
A change in the position, shape or size of a figure.
What is a pre image?
The figure before the transformation
What is the image?
The figure after the transformation
What is a rigid transformation?
One that retains the size and shape. Only the position changes.
What is a translation?
A kind of rigid transformation where all the points move
What is a directed line segment
The distance and direction of a translation
What is a reflection?
It’s a transformation figure is flipped over a line (sometimes the x or y axis)
What is the value of x for a point reflected around the X axis?
-x
What is the value of y for a point reflected around the y axis?
-y
What else is a reflection transformation called?
a flip
What is the line of reflection?
Its the line that a figure is flipped across to create the reflection (mirror image)
What is a line of symmetry
a line that divides a figure into two symmetrical halves
What is a rotation?
a type of transformation that maps points along a circular arc. A rotation happens around a point.
What is the point which is the center of a rotational transformation?
Center of rotation
Can the center of rotation be outside the figure being rotated?
Yes!
What are the formulas for clockwise rotation?
See the picture
What are the formulas for counter clockwise rotation?
See the picture
