Math Problem Statement
prove that in a parallelogram, the sum of the squares of the lengths of the diagonals equals the sum of the squares of the lengths of the four sides
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Vector Algebra
Dot Product
Parallelogram Properties
Formulas
Diagonal AC: |u + v|^2 = u · u + 2(u · v) + v · v
Diagonal BD: |u - v|^2 = u · u - 2(u · v) + v · v
Sum of squares of diagonals: AC^2 + BD^2 = 2(u · u + v · v) = 2(a^2 + b^2)
Sum of squares of sides: 2a^2 + 2b^2
Theorems
Parallelogram Law
Dot Product Formula
Suitable Grade Level
Grades 10-12
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