How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
Chapter 12 Vocabulary
Angle Relationships and Transformations
Two angles whose sum is 90 degrees.
Two angles whose sum is 180 degrees.
A pair of opposite congruent angles formed by intersecting lines.
Angles inside a polygon.
Angles on the outside of a polygon by extending the sides of the polygon.
Sum of Interior Angles Formula
Sum of Exterior Angles
A line that intersects two or more lines.
Two congruent angles in matching positions on two parallel lines cut by a transversal.
Alternate Interior Angles
Two congruent angles that lie within two parallel lines and on opposite sides of the transversal.
Alternate Exterior Angles
Two congruent angles that lie outside two parallel lines and on opposite sides of the transversal.
Same-side Interior Angles
Two supplementary angles that lie within two parallel lines and on the same side of the transversal.
Same-side Exterior Angles
Two supplementary angles that lie outside two parallel lines and on the same side of the transversal.
Measure of an interior angle of a regular polygon
Measure of an exterior angle of a regular polygon
A change made to the location or the size of a figure.
The new figure formed from a transformation.
Prime notation to identify the image point.
A transformation in which the figure slides.
(x,y) -> (x + 7, y - 4)
Covering a plane (piece of paper) with repeating pattern of one or more shapes with no gaps or overlaps.
A tessellation can be created with a polygon whose adjacent angles add to __________.
A transformation in which the figure is flipped over a line.
Line of Symmetry
A line that divides the figure into two reflecting parts.
A transformation in which a figure is turned about a fixed point.
A figure that when rotated, looks the same as the original.
Order of Rotational Symmetry
How many matches a figure has of itself as it is rotated once 360°.
A transformation that shrinks or enlargens with respect to a fixed point.
The ratio of the image to the original figure.
(x,y) -> (kx, ky), Given k, the scale factor such that k>0
Reflection of x-axis
Reflection of y-axis
Reflection of y=x
Reflection of y=-x
90° Clockwise rotation about the origin
90° Counterclockwise rotation about the origin
180° Rotation about the orgin