Standard: 7.G.5

Subject Area: Mathematics (NYS P-12 Common Core)

Grades: Intermediate, 7th Grade

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.

Standard: 8.G.5

Subject Area: Mathematics (NYS P-12 Common Core)

Grades: Intermediate, 8th Grade

Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so.