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# What Is a Circle's Eccentricity?

**The eccentricity of a circle is zero.** For a curved shape such as an ellipse, parabola or hyperbola, the eccentricity indicates how far away the shape is from being a circle. The more circular the shape is, the smaller the eccentricity. However, the flatter it is, the greater the eccentricity.

The eccentricities of certain shapes fall within defined ranges. For an ellipse, the eccentricity lies between zero and one. A parabola, which is typically more stretched out, has an eccentricity of one. The eccentricity of a hyperbola is greater than one. However, a straight line has an eccentricity of infinity. In a practical application, the eccentricity of the earth's orbit around the sun is 0.02, because the path is not quite circular.

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Q:
## What Is an Eccentric Circle?

A: Eccentric circles are circles that do not share the same center although the centers of each circle are all contained within at least one of the circles. T... Full Answer >Filed Under: -
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## What Is the Formula for the Area of a Circle?

A: The formula for the area of a circle is pi multiplied by the radius of the circle squared. The radius of the circle is the length of a straight line stretc... Full Answer >Filed Under: -
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## How Do You Convert Circumference to Diameter?

A: To calculate a circle's diameter from its circumference, one should divide the circumference by the constant pi, which is an irrational number approximatel... Full Answer >Filed Under: -
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## How Do You Measure the Diameter of a Round Object?

A: The diameter of a circle is the length of a straight line going from one side of a circle to the opposite side. To measure the diameter, simply choose two ... Full Answer >Filed Under: