How to Find Area of Square Given the Diagonal

In this video I explain how to find the area of a square given the diagonal, including a step-by-step example.
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x² + x² = 8² 2x² = 64. x² = 32. 32 square units. Other formula: 0.5 × diagonal squared. 0.5 × 8² = 0.5 × 64 = 32 square units.