You may also like

problem icon

Have You Got It?

Can you explain the strategy for winning this game with any target?

problem icon

Is There a Theorem?

Draw a square. A second square of the same size slides around the first always maintaining contact and keeping the same orientation. How far does the dot travel?

problem icon

Card Trick 2

Can you explain how this card trick works?

Hidden Rectangles

Age 11 to 14 Challenge Level:

Picture of rectangles

Rectangles are considered different if they vary in size or have different locations.

How many different rectangles can be drawn on a chessboard?

How many of the rectangles are squares?

What happens on an n by n board?