Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 37
e, e B, etc., for theinscribed figure. To describe a regular octagon about a circle (Fig. 70). // / ^N.^ / \ \ / \ \^ /? Fig. 70. 20 CONSTRUCTION OF GEOMETRICAL PROBLEMS. Describe a square about the given circle A B ; draw perpendiculars h k^ etc.,to the diagonals, touching the circle. Or, to find…
Mechanical drawing
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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-94-180.webp)