Lessons for G.SRT.B.4
Proving the Pythagorean theorem with similar trianglesThe altitude to the hypotenuse makes two similar copies whose ratios combine into the theorem.Lesson
Proving the triangle proportionality theoremA line parallel to one side makes a smaller similar triangle, and that similarity gives the proportion.Lesson
Triangle proportionality theoremA line parallel to one side splits the other two in the same ratio.Lesson
Printable Worksheets
Proving the Pythagorean theorem with similar triangles worksheet (PDF)Printable worksheet with answer keyPreview
Proving the triangle proportionality theorem worksheet (PDF)Printable worksheet with answer keyPreview
Triangle proportionality theorem worksheet (PDF)Printable worksheet with answer keyPreview