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Let's draw a regular octagon inscribed in a circumference.

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An octagon is a polygon of 8 sides and since we want it regular, the sides need to measure the same.

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So the first thing that we are going to do is to draw a diameter.

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And then we are going to draw a perpendicular one.

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Another diameter perpendicular to the first one.

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Okay, look what I have done with the square, yeah, when I have put the, well, we have done, okay, two perpendicular diameters, okay, so look at the square, because when I turn it, I don't know if you can see it inside the video, okay, I turn the square, yeah, and here I draw perpendicular lines to the previous one,

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But, if I slide it and I draw over this side of the square, okay, I have here 45 degrees, okay?

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Because in the square here I have 45 degrees, okay?

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So now, and here there are 90, okay? Half and half.

10
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So now what I'm going to do is to draw a perpendicular line to this diameter, okay?

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A perpendicular diameter to the previous one, and I have divided the circumference in eight

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equal parts.

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Let's draw a regular octagon in square.

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Dang!

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Dang!