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NOT POSSIBLE
It is not possible to put 20 isosceles triangles into the form of a square. It takes 2 isosceles triangles to make one square. 6 more isosceles triangles would have to be added before a larger square could be made.
For an isosceles triangle with leg length x, the number of triangles needed to make a square is modeled by the equation
N = 2 * x2
where N is the number of triangles and x is the number of isosceles triangles touching any side of the square.
There is no integer solution for x when N = 20, meaning it is not possible to arrange 20 isosceles triangles in the shape of a square.
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How many triangles are there in a 4 by 5 grid?
If its a 4 by 5 grid, there are 20 squares because 4 times 5 =20 20 by 2 is 40 so there are 40 triangles because there are 2 triangles that fit into each square. Hope this helps!
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There are several: a tetrahedron with 4 equilateral triangles. An 8-sided solid (think of 2 Egyptian pyramids, turn one upside down and put the two square bases together). A 20-sided also has equilateral triangles.
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20
