Online Geometry Problem 514: Triangle, Five Squares, Line, Area. Level: High School, SAT Prep, College, Mathematics Education

The drawing shows the squares of area A₁, A₂, A₃, A₄, and A_5.  Prove that the area of triangle A equals A₃.

See also:
Kaleidoscope of Problem 514 base on Poincare Disk Model
Art of Problem 514 using Mobile Apps