Thursday, August 27, 2026

Geometric Challenge

Problem 1622: Outer Hexagon Formed by External Squares on a Triangle

Share your proof or solution in the comments below.
Target Audience: K-12, Honors Geometry, and College Mathematics Education.

In Problem 1622, we explore a triangle with external squares on each side, forming an outer hexagon. The challenge is to prove that the sum of the squares of the six sides of the outer hexagon equals four times the sum of the squares of the original triangle's sides.
Explore the full theorem and illustrated diagram by clicking the image below.

Illustration of Geometry Problem 1622: Outer Hexagon Formed by External Squares on a Triangle
Click for additional details and full diagram.

How to contribute:
Post your step-by-step proof in the comments below. Feel free to:
  • Describe the theorems applied.
  • Share a link to your dynamic construction (GeoGebra, Desmos).
Be the first to submit a formal solution for this problem!
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