Circular robotic vacuum cleaners may be popular, but it's hard for them to reach dust and dirt in the corners of rooms. That's why Panasonic has gone with a triangular shape – a Reuleaux triangle, to ...

Have you ever wondered why the cover of a manhole is nearly always round? Why isn’t it oval or square? Reuleaux curve based on an equilateral triangle. Reuleaux curves based on the pentagon (top) and ...