Calculate the area of common 2D shapes: rectangle, triangle, circle, trapezoid, ellipse, sector, polygon, and more.
| Shape | Formula |
|---|---|
| Square | A = a² |
| Rectangle | A = l × w |
| Triangle (Base & Height) | A = ½ × b × h |
| Triangle (3 Sides) | A = √(s(s−a)(s−b)(s−c)), s = (a+b+c)/2 (Heron's) |
| Circle | A = πr² |
| Parallelogram | A = b × h |
| Trapezoid | A = ½(a + b) × h |
| Rhombus | A = (d₁ × d₂) / 2 |
| Ellipse | A = π × a × b |
| Sector | A = (θ/360°) × πr² |
| Regular Polygon | A = (n × s²) / (4 × tan(π/n)) |