The apron : its traditions, history and secret ... - Masonic Renewal

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The Masonic Apkon.
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Fig- 4. Triangles and Taus of the Squared Circles of
Equal Perimeter and Equal Area.
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These particular triangles have the peculiarity that the base of
the first is the side of a square and its vertical axis the radius of
a circle equal in area to that square, while the second shows the
base of a square with relation to which the vertical axis is so
very close to the radius of a circle of equal perimeter that the
Egyptians really accepted it as such, although it goes a mere
trifle over the mark and there is a secret way of discovering the
exact truth, which they also possessed.
Xow in multiplying the squares of this famous Pythagorean
problem equally by four we secure the following figure:
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Fig. 5. The essential angles of the Key diagram Fig. 14.
which is
the one upon which the Magian philosophy was really