Posted by Bobby Lee on Thursday, March 22, 2012 at 5:19pm.
The inside has to equal 360 since its a 4 sided figure
you know 2 sides which are 90
and the third side is 52
so
360= 52 + 90 + 90 + x
solve for x
360 - 90 - 90 - 52 = x
x=128
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