Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 158
pyramid, you made by the same rays two triangles, andso proved that the height of the pyramid was to the length of the stickas the shadow of the pyramid to the shadow of the stick. This compu-tation was regarded by the Egyptians as quite remarkable, since they werenot familiar with applications of… … Thales 148 PLANE GEOMETRY Proposition XX. Problem 372. To constriLcb a perpendicular to a ^iven straightline at a given point in the line. (Second method. For another method, see § 148.) L^ ..- >■ Q M /P *» Given line AB and P, a point in AB,To construct a J_ to AB at P. I. Construction 1. With…
Geometry, Plane · Geometry, Solid
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