Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, b. 1879 · New York : H. Holt and Company · leaf 25
r of gravity of the tetrahedron. 14. Show that the lines joining each vertex of a tetrahedron to the pointof intersection of the medians of the opposite face pass through the center ofgravity. 15. Show that the lines joining the middle points of the sides of anyquadrilateral form a parallelogram.… … tion angles a, ^, y. The positionof the line OP is determined byrt, (3, y and the position of P onthe line is given by p, so that theposition of the point P in spaceis fixed when p, a, ^, y areknown. These quantities p, a, ft,y are called the polar coordinatesY ^^i- «■ of P. As a, ft, y are…
Geometry, Analytic
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