How many squares can be made from a grid of ten by ten dots (ignore diagonal squares)?
Here is a strong hint to get you started.
if we draw the vertical sides of the square and extend them all the way to the top and bottom of the grid, how many choices are there for the lines? Just as many ways as there are to choose 2 objects out of 10.
if we draw the vertical sides of the square and extend them all the way to the top and bottom of the grid, how many choices are there for the lines? Just as many ways as there are to choose 2 objects out of 10.
Hi, what I did was that if there are 10x10 dots, then we can make: