Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 143
d when, at ihit same time, the peri)endicular let fallfrom the vertex on the j)lane of the base ))asses through thecentre of the base. That perpendicular is then called the axisof the pyramid. ir>. Any line, as SF, drawn from the vertex S of a regularpyramid, pfT[)endicuIar to either side of the… … 144 GEOMETRY. 17. Two polyedrons are similar when they are containedby the same number of similar planes, similarly situated, andbavins: like inclinations with each other. PROPOSITION I. THEOREM. The convex swfuce of a right prism is equal to the perimeter ofits base multiplied by its altitude. Let…
Trigonometry · Geometry
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