Given a rectangle
, draw 
on an
extension of 
.
Bisect 
and
call the midpoint 
.
Now draw a semicircle centered at 
, and
construct the extension of 
which
passes through the semicircle at 
. Then
has
the same area as 
. This can be shown as follows:  |
 |
 |
(1)
|
 |
 |
 |
(2)
|
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