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Mathematics, 29.05.2021 03:50 182075

HEL Grogg splits an 11-gon into triangles by drawing all the diagonals from one vertex.
Miraculously, each of these triangles has area 15. What is the area of the original 11-gon?

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HEL Grogg splits an 11-gon into triangles by drawing all the diagonals from one vertex.
Mirac...
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