# Proof without Words: Algebraic Areas

by Shirley Wakin (University of New Haven)

Mathematics Magazine
September, 1984

Subject classification(s): Numbers and Computation | Measurement | Area
Applicable Course(s): 2.1 College Algebra

A visual proof of the identity
$$(a + b)^2 + (a - b)^2 = 2(a^2 + b^2)$$

A pdf copy of the article can be viewed by clicking below. Since the copy is a faithful reproduction of the actual journal pages, the article may not begin at the top of the first page.