Mathematics for Carpenters and Builders - Carpenter's and Builder's Math, Plans, and Specifications - page 165

E F

G D

H C

k

A B

Figure 5-47 To describe an octagon on a given straight line.

g

f

A B

o

h

e

n k

D m l C

Figure 5-48 To inscribe an octagon in a square.

Problem 29
To inscribe an octagon in a circle.
In Figure 5-49, draw two diameters AC and BD at right angles.
Bisect the arcs AB , BC , and so forth, at e , f , and so forth, to form
the octagon.