Geometry Area Calculator
Calculate areas of common shapes such as circles, rectangles, triangles, trapezoids, and ellipses.
Select Shape
Circle Area Calculation
Area Formula Reference
- Circle: S = πr²
- Rectangle: S = a × b
- Triangle: S = ½ah
- Trapezoid: S = ½(a + b)h
- Ellipse: S = πab
- Parallelogram: S = ah
- Sector: S = πr²θ/360
- Rhombus: S = ½d₁d₂
Usage Instructions
Features
Calculate areas of 8 common geometric shapes including circles, rectangles, triangles, trapezoids, ellipses, parallelograms, sectors, and rhombuses online, with formulas shown alongside for learning and verification.
Steps
Click a shape in the "Select Shape" area → Enter the required parameters (such as radius, base, height) → The area and formula will be displayed automatically below.
Notes
All calculations run locally in your browser with no data uploaded; inputs must be positive numbers, sector angle range is 0-360 degrees; results keep high-precision decimals and will not display when parameters are incomplete or invalid.