Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 55
er adjacent side,which, if the angle is strictly a right angle, will be perpendicular to the firstline. Turn the triangle on this perpendicular side, bringing it into the positionABC; if now the sides of the triangle agree with the line B C and A B,the angle is a right angle, and the sides are… … £ Fig. 116. C
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![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-84-118.webp)
