The Square Root of A Line

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Let's say you draw a line of length a, like this.

Let's say you draw a line of length a, like this

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And next to it, you draw a line of length 1 like this. And don't forget to put a point on the intersection between the two.

 And don't forget to put a point on the intersection between the two

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And after that, you draw a semi circle with the diameter of (a + 1) like this.

And after that, you draw a semi circle with the diameter of (a + 1) like this

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Still with me? You then draw a line, perpendicular to the diameter, starting from the point of intersection up to the edge of the semi circle. Like this.

 Like this

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