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coordinate geometry

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A side of a rectangle 2009-07-15
From hanbal:
Could please help solving this problem

A(1,3) and D(5,5) are two vertices of a rectangle ABCD. The equation of line AC is 3y=4x + 5
Find
a) the equation of line DC

Answered by Chris Fisher.
Counterclockwise 2001-09-14
From Rolanda:
When Descartes invented the coordinate system he decided to number them counter-clockwise. Why?
Answered by Chris Fisher.
 
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