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Area Calculator
Calculate the area of common geometric shapes — rectangles, circles, triangles.
About This Calculator
Area formulas are foundational in architecture, construction, agriculture, and design. The circle area formula (πr²) was first proven by Archimedes around 250 BCE. A hectare (100m × 100m) = 10,000 m²; an acre = 4,047 m². Commercial real estate pricing by price per square foot uses area calculation constantly.