The figure below shows two squares A_{1}B_{1}C_{1}D_{1} and A_{2}B_{2}C_{2}D_{2}. If A, B,
C, and D are the midpoints of A_{1}A_{2},
B_{1}B_{2}, C_{1}C_{2}, and D_{1}D_{2},
respectively, prove that ABCD is a square.
Art of Geometry Problem 1145 using Mobile Apps
Art of Geometry Problem 1145 in Motion
Click on the figure below.
