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Area of Ellipse Calculator

Online ellipse area: S=πab; a=b gives the circle area πr².

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S = π a b
Positive
Positive

📖 Tutorial | Ellipse Area

1. Definition
An ellipse with semi-axes a, b has area S=πab.
2. Formula & Notation
a,bSemi-axes
3. Properties & Laws
  • S=πab;
  • a=b gives πr²;
  • Square units;
  • No simple perimeter formula.
4. Steps
  1. Enter a,b;
  2. Click "Area";
  3. Or click "Load Example".
5. Worked Examples
Example: 5,4: S=20π≈62.83.
6. Common Pitfalls
It is πab;
Not for perimeter;
Positive.

❓ FAQ | Ellipse Area

Formula?
πab.
Circle?
a=b.
Perimeter?
No simple form.
Example?
20π.
Units?
Square.
Half?
Separate.