When writing fun stuff for my company’s global communications site, sometimes I like to throw in a brainteaser every now and again—especially given that a lot of PTC’s employees and customers are engineers. So here are two geometry puzzles to get those old mental juices flowing! 64 = 65 Geometry Paradox Where does the hole in second triangle come from (the partitions are the same)? Write Numbers Write the numbers from 1 to 8 into the squares, so that the squares with consecutive numbers do not touch (neither edges nor corners). These and other amazing geometry puzzles can be found here on BrianDen.com.