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In the figure below, how many rectangles are there that are not squares?

 

 Dec 16, 2019
 #1
avatar+108790 
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Lots try counting them systematically

 

1 x 2 ?

1 x 3 ?

1 x 4 ?

1 x 5 ?

 

2 x 3 ?

2 x 4 ?

2 x 5 ?

 

3 x 4 ?

3 x 5 ?

 

4 x 5 ?

 

that is it.

Please no one else interfer.  Asker guest can do this by themselves now.  How else will they learn? 

 Dec 16, 2019

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