Finding the Length of a Diagonal Without Using a Ruler

This lesson teaches how to find the length of a diagonal by creating a square. It reviews square units and square numbers, discusses common mistakes students make, and explains how to calculate areas of squares. The lesson also covers methods to find diagonal lengths without using a ruler, emphasizing the importance of counting units and understanding square roots.

How many square units are inside a square with a side length of 4 centimeters?

If a square has an area of 49 centimeters squared, what is the length of one side?