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 A+ A− B

# Coordinate Geometry

## Using the coordinate plane in proof

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

Coordinate Proof 2
Prove that ABCD is a rectangle.

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