Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 129
128 GEOMETRY. Of the Pyramid 10. A pyramid is a solid, formed byseveral triangles united at the samepoint S, and terminating in the differ-ent sides of a polygon ABCDE. The polygon ABCDE, is called thelise of the pyramid ; the point *S, iscalled the vertex, and the trianglesASB, BSC, CSD, DSE, and… … 11. A pyramid whose base is a triangle, is palled a titan-gular pyramid ; if the base is a quadrangle, it is called aquadrangular pyramid ; if a pentagon, it is called a petagonalpyramid; if the base is a hexagon, it is called a hexagonalpyramid; &c. 12. The altitude of a pyramid, is…
Geometry · Plane trigonometry
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-102-236.webp)
