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# Types of angles

Acute angle measures less than 90 degrees
Right angle measures exactly 90 degrees
Obtuse angle measures greater than 90 degrees but less than 180 degrees
Straight angle measures exactly 180 degrees; straight line
Complementary angles 2 angles that add to 90 degrees
Supplementary angles 2 angles that add to 180 degrees
Parallel lines 2 lines that will never meet; I I
Transversal A diagonal line that cuts through 2 parallel lines, forming angles
Vertical angles Angles across from each other
Corresponding angles Angles that are in the same spot, but on a different line; on the same side
Alternate interior angles Angles that are "inside" the sets of parallel lines; on opposite sides
Alternate exterior angles Angles that are "outside" the sets of parallel lines; on opposite sides
Created by: tjavarone
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