Q:
# What is the formula for eccentricity?

**The formula for calculating eccentricity is e = c/a.** In this formula, "e" refers to the eccentricity, "a" refers to the distance between the vertex and the center and "c" refers to the distance between the focus of the ellipse and the center.

Credit:
Bart Coenders
E+
Getty Images

In general, the term eccentric refers to something being off center. Mathematicians calculate eccentricity to determine how close the resemblance is between a conic section and a circle. A circle's eccentricity is always zero and with an ellipse, the eccentricity is less than one, but greater than zero. The eccentricity of two conic sections must be equal for them to be similar.

Learn more about Geometry-
Q:
## How do you find the area of a semicircle?

A: To find the area of a semicircle, use the formula 1/2(pi x r^2). You need the value of "r," or radius of the circle, and pi. Full Answer >Filed Under: -
Q:
## What is the formula for calculating a right-angled triangle?

A: The formula for calculating the length of one side of a right-angled triangle when the length of the other two sides is known is a2 + b2 = c2. This is know... Full Answer >Filed Under: -
Q:
## What formula is used to find the diameter of a circle?

A: The diameter of a circle can be calculated using the formula d = 2r, where "d" indicates the diameter and "r" denotes the radius of the circle. In terms of... Full Answer >Filed Under: -
Q:
## What is calculated using the formula of length x width x depth?

A: The formula of length x width x depth is used to calculate volume of box-shaped areas. For example, the formula can be used to calculate the volume of stor... Full Answer >Filed Under: