Construction & Geometry · Glossary
What is Area?
Quick definition
The amount of 2D space inside a shape, measured in square units (m², ft², acres, hectares).
Full explanation
Area is the measure of a 2D surface. Common units: square meters (m²), square feet (ft²), acres (43,560 ft²), hectares (10,000 m²). Formulas: Rectangle A = length × width; Triangle A = ½ × base × height; Circle A = π × r²; Trapezoid A = ½ × (b1 + b2) × height. Surface area is the 3D equivalent (sum of face areas). Area is critical for flooring, paint, roofing, landscaping, and land purchase. To convert between units: 1 m² = 10.764 ft². Acre is a common real estate unit; hectare is the metric equivalent. A football field is ~1 acre (without end zones).
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Related terms
More from Construction & Geometry
Volume
The amount of 3D space inside a shape, measured in cubic units (m³, ft³) or in liters/gallons.
Perimeter
The total distance around the outside of a 2D shape. Measured in linear units (m, ft).
Circumference
The perimeter of a circle — the total distance around it. C = 2πr, or C = πd.
Slope
The steepness of a line, calculated as rise over run. Slope = (y₂ - y₁) / (x₂ - x₁).
Density
Mass per unit volume, typically in kg/m³ or g/cm³. Different materials have characteristic densities.
Last reviewed: June 15, 2026 • Category: Construction & Geometry