Fish's Arithmetic Number Two: Oral and Written, Upon the Inductive Method, Book 2

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Ivison, Blakeman, & Company, 1883 - Arithmetic - 352 pages

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Page 257 - A house that is 50 ft. long and 40 ft. wide has a square or pyramidal roof, whose height is 15 ft. Find the length of a rafter reaching from a corner of the building to the vertex of the roof.

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