The N-tiling of the triangle ABC with the triangle T is a process of cutting the triangle ABC into N congruent smaller triangles. The smaller triangle T is called the tile. So far, little is known about the possible values of the number N, which is the main subject of the master's degree. When the tile T is similar to the triangle ABC, we can prove that three forms of the number N are possible. When N is a perfect square, any triangle can be N-tiled. However, the tile T is a right triangle if N∈{e2+f2,3n2;n,e,f∈N}. The tile T has commensurable angles if each one of them is a rational multiple of number π. Furthermore, let a triangle ABC be N-tiled with the tile T, which has commensurable angles and is not similar to the triangle ABC. If the triangle ABC is equilateral, it has T angles (π6,π3,π2)︁ or (π12,π3,7π12)︁ and N=6n2 or it has T angles (π6,π6,2π3)︁ and N=3m2. However, if ABC is an isosceles triangle with base angle α and tiled with the tile T, which is similar to one half of the triangle ABC, then N is an even number. Moreover, the possible values of N are analyzed, if not all angles of the tile T are commensurable. We can prove that N≥8, when the triangle ABC is N-tiled with the tile that is not similar to the triangle and has angles that are not all commensurable. Finally, we prove, based on above examples, that the 7-tiling of the triangle with the congruent tiles does not exist.
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