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Let's draw a triangle, an equilateral triangle inscribed in a circumference.

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A polygon is inscribed in a circumference when all the vertex are on the circumference.

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And it must be equilateral.

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

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Well, any diameter.

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This is going to be point A, for example.

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okay one of the of the vertex of the triangle and I'm going to call this point P just to understand

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ourselves. Now I'm going to place the needle of the compass in P and with the same radius of the

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circumference I'm going to make an arch so where this arch cuts the circumference I'm going to

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place point B and point C. And here we have an equilateral triangle. All the

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sides measure the same and the angles measure 60 degrees.