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7 x 7 = 7
A Heptiamond Equation

presented by Kate Jones
for the attendees of Gathering for Gardner VII
March 16-19, 2006 – Atlanta, Georgia

Heptiamonds are made of 7 edge-joined equilateral triangles. The selected 7 heptiamonds shown here can form both the order-7 triangle and the numeral 7 below. Enjoy!

7 selected heptiamonds

Solve the number 7

Solve the triangle

All these heptiamonds are part of a set of polyiamonds orders 1 through 7, made by Kadon under the name, Iamond Ring. Kadon has been making polyforms and other mathematical recreations “for the joy of thinking” since 1980.

Kadon Enterprises, Inc.
1227 Lorene Dr., Suite 16
Pasadena, MD 21122
Phone/fax:  410-437-2163

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©2007 Kadon Enterprises, Inc.