Lesson Support Videos

U9L4a. Use supplementary angles to find an unknown angle

U9L4b. Use complementary angles to find an unknown angle

U9L4c. Use vertical and adjacent angles to find unknown angles

U9L4d. Use interior and exterior angles to find unknown angles

U9L4e. Use consecutive interior angles to find unknown angles

U9L4f. Use interior angles of triangles to find unknown angles 

Extra Skill Practice

Complete this worksheet: 

IXL Skill Practice

Master these skills: 

X.1 Lines, line segments, and rays

X.2 Parallel, perpendicular, intersecting

X.3 Name, measure, and classify angles

X.4 Identify complementary, supplementary, vertical, adjacent, and congruent angles

X.5 Find measures of complementary, supplementary, vertical, and adjacent angles

X.6 Transversal of parallel lines

Khan Academy

Master these skills: A, B, and C.