The normal elementary geometry : embracing a brief treatise on mensuration and trigonometry : designed for academies, seminaries, high schools, normal schools, and advanced classes in common schools (1884)
Brooks, Edward, 1831-1912 · Philadelphia : Christopher Sower Co. · leaf 230
CASE VII. 60. To find the distance between two inaccessible objects when points canbe found at which both objects can be seen. Method.—The method of measurementis indicated in the following problem.The method of solution we prefer leavingto the ingenuity of the pupil, that he maylearn to think for…
Geometry · Plane trigonometry
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