G.CO.9

Prove theorems about lines and angles. Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment's endpoints.

1.		Convincingly Congruent and Simply Similar 2 - identify congruent and similar shapes
2.		Convincingly Congruent and Simply Similar 1 - identify congruent and similar shapes
3.		ABCs 11 - geometric reasoning - supplementary angles on parallel lines
4.		ABCs 8 - geometric reasoning - corresponding angles on parallel lines
5.		ABCs 7 - geometric reasoning - properties of parallel line
6.		ABCs 6 - geometric reasoning - parallel lines
7.		ABCs 5 - geometric reasoning - lines intersecting parallel lines
8.		ABCs 2 - angle sum of quadrilateral, degrees in revolution
9.		ABCs 4 - geometric reasoning - angles on parallel lines
10.		ABCs 3 - geometric reasoning - angles on parallel lines
11.		Shape Up! 14 - calculate size of opposite angles, algebraic expression
12.		Shape Up! 8 - calculate angle size; parallel lines, triangles
13.		Shape Up! 4 - calculate size of angles in isosceles triangle, angle sum of a triangle