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The line segment from (-a, 0) to (a, 0), is called the major axis of the ellipse. ... ellipse A curved planar figure, the locus of all points which have the same total distance from two fixed points called the foci...
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math.comsci.us/analytic/ellipse.html
math.comsci.us/analytic/ellipse.html
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If no line of the cone is parallel to the plane, the intersection is a closed curve, called an ellipse. If one line of the cone is parallel to the plane, the intersection is an open curve whose two ends are asymptotically parallel; ... The Math Forum...
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mathforum.org/dr.math/faq/formulas/faq.ellipse.html
mathforum.org/dr.math/faq/formulas/faq.ellipse.html
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Definition of the Ellipse ... To read how the ellipse got its name, and what it means, see Parabola. That page also contains some background information on conic sections and other topics that also applies to ellipses, that won't be repeated here.
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www.du.edu/~jcalvert/math/ellipse.htm
www.du.edu/~jcalvert/math/ellipse.htm
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Definition and properties of an ellipse ... An ellipse looks like a circle that has been squashed into an oval. Like a circle, an ellipse is a type of line. Imagine a straight line segment that is bent around until its ends join. Then shape that loop until it is an ellipse - a sort of 'squashed circle' like the one above.
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www.mathopenref.com/ellipse.html
www.mathopenref.com/ellipse.html
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The semi-major and semi-minor axes of an ellipse are radii of the ellipse (lines from the center to the ellipse). The semi-major axis is the longest radius and the semi-minor axis the shortest. If they are equal in length then the ellipse is a circle.
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www.mathopenref.com/ellipsesemiaxes.html
www.mathopenref.com/ellipsesemiaxes.html
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Definition: An ellipse is the set of points for each of which the sum of the distances from two fixed points (foci) is a given constant. The distance from a focus to a point on the ellipse is called a focal radius.
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www.mecca.org/~halfacre/MATH/ellipse.htm
www.mecca.org/~halfacre/MATH/ellipse.htm
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The Math Behind the Fact:; One way to see why the formula is true is to realize that the above ellipse is just a unit circle that has been stretched by a factor A in the x-direction, and a factor B in the y-direction.
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www.math.hmc.edu/funfacts/ffiles/10006.3.shtml
www.math.hmc.edu/funfacts/ffiles/10006.3.shtml
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The ellipse is a very special and practical conic section. One important property of the ellipse is its reflective property. If you think of an ellipse as being made from a reflective material then a light ray emitted from one focus will reflect off the ellipse and pass through the second focus. ... Math Beyond School...
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mathcentral.uregina.ca/beyond/articles/Lithotripsy/lith...
mathcentral.uregina.ca/beyond/articles/Lithotripsy/lithotripsy1.html
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An ellipse has two focus points. The word foci (pronounced 'foe-sigh') is the plural of 'focus'. One focus, two foci. The foci always lie on the major (longest) axis, spaced equally each side of the center. If the major axis and minor axis are the same length, the figure is a circle and both foci are at the center.
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www.mathopenref.com/ellipsefoci.html
www.mathopenref.com/ellipsefoci.html
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