Area Formulas
| Shape | Area Formula | Perimeter Formula |
|---|---|---|
| Rectangle | width x height | 2(w + h) |
| Circle | pi x r^2 | 2 x pi x r |
| Triangle | 0.5 x base x height | a + b + c |
| Trapezoid | 0.5 x (a + b) x h | a + b + legs |
| Ellipse | pi x a x b | Approximation |
Frequently Asked Questions
Divide the shape into regular shapes (rectangles, triangles) and add their areas. For curved shapes, use integration or the shoelace formula for polygons with known vertices.
The calculator works with any consistent unit. If you enter measurements in meters, the area will be in square meters. If in feet, the area is in square feet. Just be consistent with your input units.