Mechanical drawing : a manual for teachers and students (1902)
Cross, Anson Kent · Boston : Ginn & Co. · leaf 25
Problem 18. — To construct a regular octagonwithin a given square ABCD. Draw the diagonals of the square, whichintersect at its centre, z, and with points A, B,C, and D as centres and a radius, A /, equal tohalf the diagonal, describe arcs intersecting thesides of the square in points 2, j, <?,… … Problem 19. — To inscribe a regular pentagonwithin a given circle C. Draw the diameter i—2^nd a radius j-^ per-pendicular to it. Bisect 2-3 in 5, and with 5 ascentre and radius ^-4, intersect 2-1 in 6. With4 as centre and radius 4-6 intersect the circle in7. Set off the distance 4-/ from y to 8, 8…
Mechanical drawing
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-56-108.webp)
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-58-118.webp)
