How accurate are the area calculations?

The tool uses the standard formulas: circle A = πr², rectangle A = w × h, and triangle A via Heron’s formula—exact to machine precision.

Can I use the SVG for design mockups?

Yes, the SVG scales to the input values and can be exported as a vector image for use in design mockups or presentations.

What happens if the triangle sides don't form a valid triangle?

The tool flags an error and displays “Invalid triangle” instead of numerical results, adhering to the triangle inequality theorem.

Are the results rounded?

Values are shown with 4 decimal places; you can adjust precision in the settings if more or less detail is required.

2D Geometry Calculator

Instantly calculate area and perimeter of common 2D shapes and visualize them with a dynamically drawn SVG diagram. Circle area=πr², rectangle area=w×h, triangle via Heron's formula, all updated live.

Radius:

Area: 0.0000 Circumference: 0.0000

Width:

Height:

Area: 0.0000 Perimeter: 0.0000

Side A:

Side B:

Side C:

Area: 0.0000 Perimeter: 0.0000

Instant Visual 2D Geometry

For students, designers, and estimators, manually calculating area and perimeter of circles, rectangles, and triangles can be tedious and prone to errors. This 2D Geometry Calculator eliminates the guesswork by providing instant, accurate metrics and, uniquely, an auto-drawn SVG diagram of your shape. Whether you're verifying homework or sketching a quick layout, get immediate visual confirmation alongside precise numerical results.

The tool uses standard formulas: circle area (πr²), rectangle area (w×h), and triangle area (Heron's formula). This ensures algorithmic correctness and reliability for your everyday geometric needs. Just input your dimensions and watch the results and diagram update live!

How to Use This Tool

Choose the shape tab (Circle, Rectangle, or Triangle) you wish to analyze.
Enter the required dimensions (radius, width/height, or three side lengths) into the input fields.
Observe the live updates of area and perimeter displayed in the badges.
View the scaled SVG preview for a quick visual check of your shape.
Values are shown with 4 decimal places, ensuring precision for most applications.

FAQ

Q: How accurate are the area calculations?: A: The tool uses the standard formulas: circle A = πr², rectangle A = w × h, and triangle A via Heron’s formula—exact to machine precision.
Q: Can I use the SVG for design mockups?: A: Yes, the SVG scales to the input values and can be exported as a vector image for use in design mockups or presentations.
Q: What happens if the triangle sides don't form a valid triangle?: A: The tool flags an error and displays “Invalid triangle” instead of numerical results, adhering to the triangle inequality theorem.
Q: Are the results rounded?: A: Values are shown with 4 decimal places; you can adjust precision in the settings if more or less detail is required.