Chapter 7 Vocabulary: Angles, Triangles, and Quadrilaterals

An angle that is less than 90 degrees

• Acute

• Obtuse

• Right

• Straight

An angle that is equal to 90 degrees

• Acute

• Obtuse

• Right

• Straight

An angle that is greater than 90 degrees and less than 180 degrees

• Acute

• Obtuse

• Right

• Straight

An angle that is equal to 180 degrees

• Acute

• Obtuse

• Right

• Straight

Two angles that share a common side and have the same vertex

• Congruent

• Vertical

• Adjacent

• Complementary

Opposite angles formed by the intersection of two lines

• Congruent

• Vertical

• Adjacent

• Complementary

Having the same measure (EQUAL)

• Congruent

• Vertical

• Adjacent

• Complementary

Two angles whose SUM equals 90 degrees

• Supplementary

• Vertical

• Adjacent

• Complementary

Two angles whose SUM equals 180 degrees

• Supplementary

• Vertical

• Adjacent

• Complementary

A triangle where all angles less than 90 degrees

• Obtuse

• Acute

• Equiangular

• Right