CHAPTER X¶
On Round and Lateral Pyramids in Architecture, and Praise of Leonardo da Vinci’s Incomparable Drawings.
Pyramids, both round (cones) and lateral (polygonal pyramids and obelisks/spires), will likewise be easy for you to fashion and proportion from their corresponding columns, seeing that—as our Euclid proves demonstratively ([XII.7], [XII.10]) and as we explained in Chapters LXIV–LXVIII—every pyramid, whether in weight (*al peso*) or in solid measure (*ala mesura*), is always in every way exactly one-third (:math:`frac{1}{3}`) of its cylinder or column having the same base and height!
Their order and perspective figures you have above in this volume (Plates XLIII–LIX) together with all the other regular and dependent bodies, drawn by the hand of our aforesaid fellow countryman Leonardo da Vinci of Florence (per mano del prelibato nostro compatriota Leonardo da Vinci Fiorentino)—against whose drawings and figures there was never in truth any man who could raise an objection (ali cui disegni e figure mai con verità fo homo li potesse oponere)!