2. Using opposite angles test for parallelogram, prove that every rectangle is a parallelogram.
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Given : ABCD is rectangle.
To Prove : ABCD is a parallelogram.
Proof : ABCD is a rectangle.
A = B = C = D = 90°........( angle of a rectangle )
In ABCD,
A = C } Opposite angle
B = D } are congruent.
ABCD is a parallelogram.......( property of parallelogram )
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