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Basic Angles

Foldable Angles

TermDefinition
Acute Angle An angle whose measurement is less than 90 degrees
Right Angle An angle whose measurement is 90 degrees.
Obtuse Angle An angle whose measurement is between 90 and 180 degrees.
Straight Angle An angle whose measurement is 180 degrees.
Sum of Angles The two small angles add to equal the big angle.
Supplementary Angles Two angles that sum to equal 180 degrees.
Complementary Angles Two angles that sum to equal 90 degrees.
Vertical Angles Angles that are across and equal to each other.
Bisected Angles Angles that share the same vertex and are equal to each other.
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