KöMaL 2020 C1601
The height of a lateral face of a right pyramid with a square base is twice as long as the base edge. At what percentage of this height (counting from the base) do we need to cut the pyramid with a plane parallel to the base so that the total area of the lateral surface plus top square of the resulting frustum is equal to half the lateral surface area of the original pyramid?
Official text KöMaL. Quoted with source.
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