The diagonals of a square for example divides it into 4 isosceles triangles
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Use different colours and tessalation. Works for me.
You have to specifically give the problem with the dots, but it can form all equilateral triangles.. .. . .. . . .
Yes. Pick one side of a kite. Swap an adjacent with an opposite side and you will have a parallelogram!
The tangram consists of 7 shapes: -2 large right & isosceles triangles, each covering 1/4 of the total occupied space -1 smaller right & isosceles triangle, taking up 1/8 of the total space -2 even smaller right & isosceles triangles, each occupying 1/16 of the whole area -A square using up 1/8 of total space -A parallelogram with angles 45° and 135° taking up 1/8 of space basically 5 triangles, 1 square, 1 parallelogram.
Cross two match sticks to bisect like X and place the other two match sticks at the base of the two equilateral triangles formed .