Determining Angle Measures of Intersecting Lines CC.7.G.5 Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure.

Warm Up Use the figure to answer the following: Do <1 and <2 form a linear pair? Do <4 and <5 form a linear pair? Do <5 and <3 form vertical angles? Do <1 and <3 form vertical angles? Are <1 and <5 complementary angles? Are <2 and <3 supplementary angles? Are <5 and <4 complementary angles?

Video y-1/core-geometry/v/angles-at-the- intersection-of-two-lines y-1/core-geometry/v/angles-at-the- intersection-of-two-lines

Directions: Determine the missing angle.

#1 45º?º?º

#1 45º135º

#2 65º ?º?º

#2 65º 25º

#3 35º ?º?º

#3 35º

#4 50º ?º?º

#4 50º 130º

#5 140º ?º?º

#5 140º

#6 40º ?º?º

#6 40º 50º