-Let a, b, and c represent positive real numbers. Use the figure in which has vertices at A(0,0), B(a,0), C(a+b,c), and D(b,c) to prove the following theorem.
"If the diagonals of a parallelogram are equal in length, then the parallelogram is a rectangle."

Question

-Let a, b, and c represent positive real numbers. Use the figure in which  has vertices at A(0,0), B(a,0), C(a+b,c), and D(b,c) to prove the following theorem.
"If the diagonals of a parallelogram are equal in length, then the parallelogram is a rectangle."

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The Answer of 
-Let a, b, and c represent positive real numbers. Use the figure in which  has vertices at A(0,0), B(a,0), C(a+b,c), and D(b,c) to prove the following theorem.
"If the diagonals of a parallelogram are equal in length, then the parallelogram is a rectangle."

-Let A, B, and C Represent Positive Real Numbers