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an angle whose measure is exactly 90 degrees (we place a "block" at the vertex of the angle)
angles that are across from each other in an "x" pattern (equal to each other in measure)
alternate interior angles
angles that are on the opposite sides of the line "t" and are inside the parallel lines
alternate exterior angles
angles that are outside of the parallel lines and are on opposite sides of line "t"
a closed figure that's made up of 3 or more line segments that intersect only at their endpoints
If 3 sides of 1 triangle are congruent to 3 sides of another triangle, then the triangles are congruent
If 2 sides and the angle between them (known as the "included angle") are congruent to 2 sides and the angle between them in another triangle, then the triangles are congruent
If 2 angles and the side between them (known as the "included side") in 1 triangle are congruent to 2 angles and the side between them in another triangle, then the triangles are congruent
describes the transformation in terms of changes to the coordinates of the points in the figure
a transformation that turns each point of a figure the same number of degrees around a common point
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