mathani: This puzzle consists of four hinged pieces which can be folded one way to a square and the other way to an equilateral triangle. Master puzzler Henry Dudeney demonstrated a wooden model before the London Royal Society in
A square polygon is being fully covered on both sides with wrapping paper. This is an optimal solution to the problem from the previous post as the polygon total area equals the area of the paper’s colored face.
The Carina Nebula (catalogued as NGC 3372; also known as the Grand Nebula, Great Nebula in Carina, or Eta Carinae Nebula) is a large, complex area of bright and dark nebulosity in the constellation Carina, and is located in the Carina–Sagittarius Arm. The nebula lies at an estimated distance between 6,500 and 10,000 light-years (2,000 and 3,100 pc) from Earth