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Let's make an equilateral triangle.

2
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The first thing we need to choose is the size of the side of the triangle.

3
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I think we are going to do it of 5 cm.

4
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So from 0 to 5 I make a straight line, a straight segment actually.

5
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Now I need a compass, a good compass that don't open or close when it wants, yes, when I want, okay?

6
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So I place the needle of the compass in one of the vertex of the segment and I place the

7
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pencil of the compass in the other one and I make a soft arch. Now I repeat the

8
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same, placing the compass in the other edge, in the other vertex

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and repeating the arch with the same measure of 5 centimeters. When both

10
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arch meets, I have a point that is going to be the third vertex, the third angle

11
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of my equilateral triangle. Now I have an equilateral triangle because all the

12
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sides measure the same, 5 centimeters, and the three angles measure also the same,

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60 degrees.