Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 67
PROBLEM XX. To inscribe an equilateral triangle in a circle. Through the centre C draw any diam-eter, as ACB. From 5asa centre, witha radius equal to BC, describe the arcDCE. Then, draw AD, AE, and DE,and DAE will be the required triangle. For, since the chords BD, BE, are^ach equal to the radius…
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-100-223.webp)
