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Coordinate Geometry

Using the coordinate plane in proof

Coordinate Proof 1
Prove that $$ XY \perp XC $$
Remember your lesson on perpendicular lines .

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Coordinate Proof 2
Prove that ABCD is a rectangle.
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Coordinate Proof 3)
Prove that ABCD is a trapezoid that is not isosceles.
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Prove that A(0,0), B (3,4) , C (7,9) and D (4,5) be a parallelogram?
Answer