Each PI has a link to a separate page to add resources. If you have information to add, just click on the PI. For example click on G.G.42 to start contributing.

G.G.42 Investigate, justify, and apply theorems about geometric relationships, based on the properties of the line segment joining the midpoints of two sides of the triangle

G.G.43 Investigate, justify, and apply theorems about the centroid of a triangle, dividing each median into segments whose lengths are in the ratio 2:1

G.G.44 Establish similarity of triangles, using the following theorems: AA, SAS, and SSS

G.G.45 Investigate, justify, and apply theorems about similar triangles

G.G.46 Investigate, justify, and apply theorems about proportional relationships among the segments of the sides of the triangle, given one or more lines parallel to one side of a triangle and intersecting the other two sides of the triangle

G.G.47 Investigate, justify, and apply theorems about mean proportionality: o the altitude to the hypotenuse of a right triangle is the mean proportional between the two segments along the hypotenuse o the altitude to the hypotenuse of a right triangle divides the hypotenuse so that either leg of the right triangle is the mean proportional between the hypotenuse and segment of the hypotenuse adjacent to that leg

G.G.48 Investigate, justify, and apply the Pythagorean theorem and its converse