Answer:
I think 3.
Explanation:
You make a right triangle, an isosceles, and a scalene. You can't make an equilateral, because those sidelengths are not the same size.
make the other half of the triangle on top one and then you make another triangle out of the bottom one and make the other half so you just want to put a line from one line on the right side to the bottom line so then you just need do the same thing on the left side
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