8.1
Using the square as unity with both its side and area
equal to 1, by crossing the \/2 with
the (\/5)/2 and leading a perpendicular
from the point of interesection up to the side, we divide
unity into 1/3 and 2/3.
Arithmetic proportion:
1/3, 2/3, 1
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8.2
Use the square for unity and by means of an arc from the
lower left corner,,, bring the length of side 1 down to
intersect with the diagonal \/2.
Then lead an arc from the upper right corner back up to
the upper side of the square.
Harmonc proportion:
(\/2-1), (2 - \/2), 1
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8.3
Lead an arc from the point of intersection of the half-side
with the semi-diagonal and the arc with radius equal to
the half-side to the upper side of the square.
Geometric progression:
1/f², 1/f,
1
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