The area of a regular pentagon looks about twice as a big as the pentangle star drawn within it. Is it?
What is the area of the quadrilateral APOQ? Working on the building
blocks will give you some insights that may help you to work it
A circular plate rolls in contact with the sides of a rectangular
tray. How much of its circumference comes into contact with the
sides of the tray when it rolls around one circuit?
Although we have had some numerical
answers sent in no one has explained their method.
Could you be the first to explain the
calculation so that someone else can see how it's done and why it's