There are 20 triangles inside a 22 sided polygon
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An icosahedron.
Well, any shape with a triangular face. I assume that you mean a shape that only has (identical) triangles for faces. There are 2: the tetrahedron with 4 triangles, and the icosahedron with 20 triangles. * * * * * What about a triangular dipyramid? Two triangular pyramids stuck together along one face?
the shape that can make two smaller triangles is parallelogram.
Dodecahedron. The 5 "Platonic Solids" are: Cube/ 6 square sides Tetrahedron/ 4 triangles Rhomboid/ 8 triangles Dodecahedron/ 12 pentagons Icosahedron/ 20 triangles
NOT POSSIBLEIt 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 equationN = 2 * x2where 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.