Lots of Squares: Solution

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How many squares can you make by joining the dots?

4x4 dots.

Solution

There are a total of 18 squares you can make. The table below describes how many you can make of each size.
The tilted squares are ones like this: instead of like this:

Size of square	Number
1x1	9
2x2	4
3x3	1
tilted (one dot enclosed)	4
tilted (4 dots enclosed)	1

Extension

How many squares can you make from a 5 x 5 array of dots?