# Eccentricity of an Ellipse | Summary and Q&A

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April 7, 2018
by
The Organic Chemistry Tutor
Eccentricity of an Ellipse

## TL;DR

The eccentricity of an ellipse describes its shape, with e close to 0 indicating a circular appearance and e close to 1 indicating an elongated oval shape.

## Key Insights

• 😚 The eccentricity of an ellipse determines its shape, ranging from circular (e close to 0) to elongated oval-shaped (e close to 1).
• 😥 The eccentricity can be calculated using the equation e = c/a, where c is the distance between the center and one focus point, and a is the distance to one of the vertices.
• ⭕ The eccentricity of a circle is 0 because a circle has no elongation.
• 😥 When graphing an ellipse, plotting points based on a and b values allows for accurate representation.
• 💯 The eccentricity describes the deviation of an ellipse from a perfect circle.
• 😘 A higher eccentricity value signifies a more elongated ellipse, while a lower value corresponds to a more circular shape.
• 🆘 Understanding the eccentricity helps determine the proportions and appearance of an ellipse.

## Transcript

so what exactly is the eccentricity of an ellipse the equation for it is e is equal to c over a where c is between zero and a now the eccentricity is measured between 0 and 1 for an ellipse so if e is very close to 0 then the ellipse will appear to be circular in fact it will look like a circle if e is exactly zero then you no longer have an ellips... Read More

### Q: What does the eccentricity measure for an ellipse?

The eccentricity determines the shape of an ellipse, with e close to 0 indicating a circular shape and e close to 1 indicating an elongated oval shape.

### Q: How is the eccentricity calculated?

The eccentricity is calculated using the equation e = c/a, where c is the distance between the center and one focus point, and a is the distance from the center to one of the vertices of the ellipse.

### Q: What is the eccentricity of a circle?

The eccentricity of a circle is always 0 because a circle is perfectly even everywhere, and there is no elongation.

### Q: How does the eccentricity affect the shape of an ellipse?

As the eccentricity increases, the ellipse becomes more elongated or oval-shaped. If the eccentricity decreases, the ellipse becomes more circular.

## Summary & Key Takeaways

• The eccentricity of an ellipse is defined by the equation e = c/a, where c is between 0 and a.

• If e is close to 0, the ellipse appears circular. If e is exactly 0, it becomes a circle.

• For an elongated ellipse, with e close to 1, the eccentricity determines the oval shape.

• The eccentricity of a circle is always 0, while an elongated ellipse has an eccentricity close to 1.