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Online Area Calculator
Accurately calculate the area of common 2D shapes including rectangles, triangles, circles, parallelograms, trapezoids, and squares using this easy-to-use online area calculator.
| Result | |
|---|---|
| Square Meters | 80 m² |
| Square Footage | 861.112833 ft² |
| Square Inches | 124000.248 in² |
| Square Yards | 95.6792037 yd² |
| Acres | 0.019768413 ac |
| Hectares | 0.008 ha |
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What Is This Tool?
This online area calculator helps users determine the area of various common geometric shapes by applying standard mathematical formulas. It supports shapes such as rectangles, triangles, circles, parallelograms, trapezoids, and squares, making it useful for math problems, design projects, construction, and more.
How to Use This Tool?
- Select the shape for which you want to calculate the area.
- Enter the required dimensions such as length, width, height, radius, or side lengths as applicable.
- Click the calculate button to instantly see the area result.
- Review the calculated area, which is presented using precise mathematical constants including π where needed.
Key Features
- Supports area calculation for six common 2D shapes.
- Includes formulas for rectangle, triangle, circle, parallelogram, trapezoid, and square.
- Uses precise floating-point arithmetic for accurate results.
- Simple input of necessary dimensions such as lengths, heights, radii, and bases.
- Browser-based and easy to use without any software installation.
Examples
- Calculate the area of a trapezoid with bases 10 cm and 14 cm and height 6 cm: A = 1/2 (10 + 14) × 6 = 72 cm².
- Find the area of a circle with radius 5 units: A = π × 5².
- Determine the area of a rectangle with length 8 and width 3: A = 8 × 3.
Common Use Cases
- Students solving geometry homework problems.
- Architects estimating floor space in building plans.
- Engineers and contractors planning material requirements.
- Landscapers measuring surface areas of lawns or garden sections.
- Designers calculating area for graphic or product designs.
Tips & Best Practices
- Ensure all input values correspond to the same unit system for consistent results.
- Double-check measurements to maintain calculation accuracy.
- Use this tool for perfectly shaped geometric figures or simplifications of irregular shapes.
- Understand the variables representing lengths and heights before entering data.
- Take advantage of the calculator's precision when working with constants like π.
Limitations
- Calculations assume ideal geometric shapes; irregular figures cannot be accurately measured without approximation.
- Only common 2D shapes listed are supported; other shapes require manual calculation or a different tool.
Frequently Asked Questions
- Can I calculate the area of any shape with this tool?
- This tool is designed for common 2D shapes like rectangles, triangles, circles, parallelograms, trapezoids, and squares. Irregular or other shapes are not supported directly.
- What units should I use for the input dimensions?
- You can use any consistent unit system like centimeters, meters, or inches, but ensure all inputs for a given calculation use the same units.
- Does this calculator use precise values for π?
- Yes, the calculator employs high-precision floating-point arithmetic including accurate values for π for circle area calculations.
Key Terminology
- l, w
- Length and width of a rectangle.
- b, h
- Base and height for triangles and parallelograms.
- r
- Radius of a circle.
- a, b
- Lengths of the two parallel sides of a trapezoid.
- s
- Side length of a square.
- A
- Area of the shape calculated using the appropriate formula.