The Parallelogram Law states that (a) Give a geometric interpretation of the Parallelogram Law. (b) Prove the

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The Parallelogram Law states that

| a + b ² + | a – b |² = 2|a| + 2|b|P %3D

(a) Give a geometric interpretation of the Parallelogram Law.
(b) Prove the Parallelogram Law. (See the hint in Exercise 62.)

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