Square Footage Calculator
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A rectangle is a quadrilateral with four right angles. Opposite sides are equal and parallel. The square is a special rectangle where all four sides are equal.
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Tip: The diagonal of a rectangle is always longer than either side but shorter than their sum. Quick check: d² = w² + h² (Pythagorean theorem).
w=8, h=5=A=40, P=26, d=9.43d=√(64+25)=√89
w=12, h=9=A=108, P=42, d=153-4-5 triple scaled ×3
| Property | Formula |
|---|---|
| Area | A = w × h |
| Perimeter | P = 2(w + h) |
| Diagonal | d = √(w² + h²) |
| Find side from A | w = A / h |
References
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