Level: High School, SAT Prep, College geometry.

See also:

Triangle and squares Fifteen theorems

Triangle with Squares 0 Two squares

Triangle with Squares
2 Two squares

Triangle with
Squares 3 Three squares

Triangle with Squares 4: Finsler-Hadwiger Theorem

Triangle with Squares 5 Two squares,altitude
and median

Triangle with Squares 6 Four squares

Van Aubel's theorem: Quadrilateral with squares

Parallelogram with Squares theorem