It's easy all you have to do is make a heart shape
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Two triangles can but its an irregular shape
Put four equilateral triangles so that each one of them has a vertex at a single point and the triangles abut one another. The shape will be 4/6 (= 2/3) of a regular hexagon.
Well, isn't that just a happy little challenge! To make a heptagon out of six equilateral triangles, you can start by arranging the triangles in a circular pattern with their edges touching. Then, you can add a seventh equilateral triangle on top to complete the shape. Remember, there are no mistakes, just happy accidents in art!
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4 triangles make 1 hexagon. (easy way to find out how many triangles there are in a polygon- take number of sides of the polygon, subtract 2 from it, that's your answer!)