Mathematics MA2015 (2016) Grade: 912 Geometry  10 ) Prove theorems about triangles. Theorems include measures of interior angles of a triangle sum to 180^{o}, base angles of isosceles triangles are congruent, the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length, and the medians of a triangle meet at a point. [GCO10]
Alabama Alternate Achievement Standards

Mathematics MA2015 (2016) Grade: 912 Geometry  16 ) Use the properties of similarity transformations to establish the angleangle (AA) criterion for two triangles to be similar. [GSRT3] 
Mathematics MA2015 (2016) Grade: 912 Geometry  17 ) Prove theorems about triangles. Theorems include a line parallel to one side of a triangle divides the other two proportionally, and conversely; and the Pythagorean Theorem proved using triangle similarity. [GSRT4] 
Mathematics MA2019 (2019) Grade: 912 Geometry with Data Analysis  32. Use coordinates to prove simple geometric theorems algebraically.
Alabama Alternate Achievement Standards

Mathematics MA2019 (2019) Grade: 912 Geometry with Data Analysis  34. Use congruence and similarity criteria for triangles to solve problems in realworld contexts.
Alabama Alternate Achievement Standards
