KöMaL 2019 C1559
The base of a tetrahedron is a regular triangle, and the three lateral faces unfolded and laid on the plane form a trapezium with sides 10, 10, 10 and 14 units of length. Find the sum of the lengths of all edges of the tetrahedron, and also find its surface area.
Official text KöMaL. Quoted with source.
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