Area Calculator
Rectangle, triangle, trapezoid, circle in m² and square wah
Verified against sourcesLast verified 25 September 2026
Your numbers
Result
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Tested examples
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Formula
- Rectangle = length × width
- Triangle = ½ × base × height
- Trapezoid = ½ × (sum of parallel sides) × height
- Circle = π × r²
Assumptions
- All lengths use the same unit
- π is taken to 40 digits, so circle results are always rounded
Sources
OpenStax (Rice University)
Prealgebra 2e, Appendix C Geometric Formulasaccessed 25 September 2026
Internal reference: reference/12_area_shapes.md
FAQ
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