An ellipse or oval is a figure that is traced out where the sum of the distances between two fixed points is a constant.
The shortest distance between the center of an ellipse to the edge is called the semiminor axis ( r1 )
The longest distance between the center of an ellipse to the edge is called the semimajor axis ( r2 )
Area = πr1r2
Perimeter and Surface Area Formulas
By Anne Marie Helmenstine, Ph.D., About.com
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- Triangle Perimeter and Surface Area Formulas
- Square Perimeter and Surface Area Formulas
- Rectangle Perimeter and Surface Area Formulas
- Parallelogram Perimeter and Surface Area Formulas
- Trapezoid Perimeter and Surface Area Formulas
- Circle Perimeter and Surface Area Formulas
- Ellipse Perimeter and Surface Area Formulas
- Hexagon Perimeter and Surface Area Formulas
- Octagon Perimeter and Surface Area Formulas
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