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How is it calculated?
Rectangle: length × width. Triangle: half of base × height. Circle: π × radius². Trapezoid: average of the parallel sides × height. Ellipse: π × a × b.
Use the same unit for every measurement — the result is in that unit squared (m², ft², cm²).
Common questions
How do I find the area of an irregular room?
Split it into rectangles and triangles, work out each one and add them up.