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1.3 vocab. Counterexample. disproves a theory. Right angle. 90 degrees. Acute angle. l ess than 90 degrees. Obtuse angle. g reater than 90 degrees. Vertical angles. o pposite angles. Linear pair of angles. two angles on the same line. Complementary angles.
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Counterexample disproves a theory
Right angle 90 degrees
Acute angle less than 90 degrees
Obtuse angle greater than 90 degrees
Vertical angles opposite angles
Linear pair of angles two angles on the same line
Complementary angles two angles whose sum is 90 degrees
Supplementary angles two angles whose sum is 180 degrees