HELP) Complete the coordinate proof of the theorem.
GIVEN: ABCD is a rectangle
PROVE: The diagonals of ABCD are congruent.

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The Coordinates of rectangle ABCD are A(0,0), B(a,0), C(?,?) and D(0,b)

The length of line AC is equal to
The length of line BD is equal to

The diagonals of the rectangle have the same length.
Therefore line AC is congruent to line BD.