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Given a circle (O) inscribe a square inside the circle. |
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Using a straightedge draw a diameter (AB) through the center (O)
of the circle. |
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Bisect the diameter AB with a second diameter (CD). It is important
to bisect the first diameter with a second perpendicular diameter to insure
that all the points that intersect the circumference of the circle are the
same distance from the enter of the circle and from each other; equal distances
will define a square rather than produce some other off the wall quadrilateral. |
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Produce right lines joining the ends of collateral diameters (where
they intersect the circumference of the circle): D to B; B to C; C to A;
A to D. |
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These connecting lines (DB, BC, CA, AD) form the four sides
of square ACBD inside the circle. |
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