Did You Know?
A closed curve consisting of points whose distances from each of two fixed points (foci) all add up to the same value is an ellipse. The midpoint between the foci is the center. One property of an ellipse is that the reflection off its boundary of a line from one focus will pass through the other. As a result, in an elliptical room, a person whispering at one focus is easily heard by someone at the other. An oval may or may not fit the definition of an ellipse.
Origin and Etymology of ellipse
First Known Use: circa 1753
ELLIPSE Defined for English Language Learners
Definition of ellipse for English Language Learners
: a shape that resembles a flattened circle
ELLIPSE Defined for Kids
Definition of ellipse for Students
: a shape that looks like a flattened circle
Seen and Heard
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