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Ellipse Calculator
Ellipse Calculator
Calculate ellipse area, circumference approximation, eccentricity, and foci
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Semi-axis a
Semi-axis b
A = pi ab; C uses Ramanujan's second approximation
Area
75.398224
Circumference approximation
31.730879
Eccentricity
0.745356
Focal distance
4.472136
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Ellipse diagram
Ellipse with labeled major axis, minor axis, center, and foci.
major axis = 12
minor axis = 8
F1
F2
