MATH THS – Standard Geometry Content Vocabulary: adjacent angle angle bisector bisect complementary angles linear pair midpoint segment bisector supplementary angles theorem vertical angles Angle Bisectors Segment Bisectors Segments and Angles Complementary and Supplementary Angles Vertical Angles Essential Understandings Investigate relationships among plane and solid geometric figures using geometric models, constructions, and tools Verify geometric relationships using algebra, coordinate geometry, and transformations