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What PC? 1997 February
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458822.dxr
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00013.txt
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1996-10-16
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207 b
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5 lines
a = 180 - 115 (angles on a straight line add up to 180). a = 65
b = 180 - 100 (angles on a straight line add up to 180). b = 80
The sum of the angles of a quadrilateral is 360.
d = 360 - 65 - 80 - 125
d = 90