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Let's draw a square knowing the side.

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And this is the side.

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This is the point A and this is the point B.

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To build a square we need to place 90 degrees here and 90 degrees here

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and find a way to draw the same measure in each side.

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So the first thing we have to do is to draw the right angles.

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I place the square here, I place the square here and the cartabon down below, now if I

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slide the square I can draw parallel lines here, but what I want, what I really want

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is a perpendicular line, so I turn the square, I turn it 90 degrees, instead of being here,

10
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I turn it, and now all the lines that I drew here are perpendicular to this one, so I'm

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I'm going to draw one in A and another one in B, enlarging it just in case I make it.

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This is the first step.

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Secondly, I'm going to take the measure AB with my compass, and I'm going to put this

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measure the same measure in each perpendicular line okay so now I have

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three sides that measure the same with 90 degrees on each and without changing

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the aperture of my compass okay I'm going to check that the distance between

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this point and the other point I have found is the same so the only thing that

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I have to do is to join those two points I'm going to do it with a parallel to AB

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so I check that they are really parallel okay so this is my square CD AD AB BC

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all the sides measure the same and there are four right angles