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Italian mathematical olympiad 2002, problem 2

Source:

February 13, 2012
geometry proposedgeometry

Problem Statement

The plan of a house has the shape of a capital LL, obtained by suitably placing side-by-side four squares whose sides are 1010 metres long. The external walls of the house are 1010 metres high. The roof of the house has six faces, starting at the top of the six external walls, and each face forms an angle of 30∘30^\circ with respect to a horizontal plane. Determine the volume of the house (that is, of the solid delimited by the six external walls, the six faces of the roof, and the base of the house).