Dynamic
Geometry Problem 967:
Three Equilateral Triangles, Midpoints. GeoGebra, HTML5 Animation for Tablets (iPad, Nexus). Levels:
School, College, Mathematics Education
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The dynamic figure below shows equilateral
triangles A_{1}B_{1}C_{1} and A_{2}B_{2}C_{2}. If A, B, and C are the midpoints of A_{1}A_{2},
B_{1}B_{2}, and C_{1}C_{2}, prove that the triangle ABC is an equilateral triangle.
