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Applying the distance formula, DE = a. Therefore, the missing information is: A. a.
<h3>What is the Distance Formula?</h3>Distance Formula for determining the distance between two points on a coordinate plane is given as: .
In the proof given, applying the distance formula to find DE, we have:
DE = √[(a + b - b)² + (c - c)²}
Simplifying this, we would have:
DE = √(a² + 0²) = √(a²)
DE = a
Therefore, the missing information in the proof is: A. a.
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