Freese's Dissection of Four Equilateral Triangles into One
This Demonstration shows Ernest Freese's dissection of four equilateral triangles to one equilateral triangle. The sides of the four smaller triangles are in the ratio 1:3:5:7. Carry out the five rotation and translation operations in any order.
The photograph is taken from [1, p. 48].
 G. N. Frederickson, Piano-Hinged Dissections, Wellesley, MA: A. K. Peters, Ltd, 2006.
"Freese's Dissection of Four Equilateral Triangles into One"
Wolfram Demonstrations Project
Published: June 29 2016