 ### Ivy Oval Border

An illustration of a oval ivy decorated border. ### Plane Intersecting A Cylinder

Illustration of a cylinder cut by a plane making an angle of 57° with the base. ### Internal ear

"A, oval window; B, C, D, semicircular canals; * represents the bulging part of each… ### Ellipse With Axes

Illustration of an ellipse with major and minor axes. ### Corresponding Points in an Ellipse and Circle

Illustration of half of an ellipse. "The ordinates of two corresponding points in an ellipse and its… ### Area of an Ellipse

Illustration of half of an ellipse used to show that the area of an ellipse is equal to pi times a times… ### Conic Section Ellipse

Illustration of a cone cut by a plane that is not parallel to the base and does not intersect the base. ### Conic Section Showing an Ellipse

Illustration showing the definition of an ellipse as a conic section. "The section of a right circular… ### Conic Section Showing an Ellipse

Illustration showing the definition of an ellipse as a conic section. "The section of a right circular… ### Conjugate Diameters of an Ellipse

Illustration showing that if one diameter is conjugate to a second, the second is conjugate to the first. ### Construction of an Ellipse

Illustration of half of an ellipse and its auxiliary circle used to construct an ellipse by points,… ### Demonstration of Ellipse Definition

Illustration showing the definition of an ellipse. "An ellipse is a curve which is the locus of a point… ### Focal Radii of an Ellipse

Illustration of half of an ellipse. "If d denotes the abscissa of a point of an ellipse, r and r' its… ### Ellipse Inscribed In A Circle

Illustration of an ellipse, whose major axis is vertical, inscribed in a circle whose diameter is equal… ### Ellipse With Parts Labeled

Illustration of an ellipse with foci F' and F, major axis A' to A, minor axis B' to B, and center O. ### Line Bisecting Angle Between Focal Radii on Ellipse

Illustration of half of an ellipse. "If through a point P of an ellipse a line is drawn bisecting the… ### Ordinate and Major Axis of Ellipse

Illustration of half of an ellipse. The square of the ordinate of a point in an ellipse is to the product… ### Parallel Tangents to an Ellipse

Illustration showing that tangents drawn at the ends of any diameter are parallel to each other. ### Point Distances to Foci on Ellipse

Illustration of half of an ellipse. "The sum of the distances of any point from the foci of an ellipse… ### Tangent From External Point to an Ellipse

Illustration of how to draw a tangent to an ellipse from an external point. ### Tangents to an Ellipse

Illustration showing the tangents drawn at two corresponding points of an ellipse and its auxiliary… ### 16 Rotated Concentric Ellipses

Illustration of 16 concentric congruent ellipses that are rotated about the center at equal intervals… ### 2 Concentric Ellipses

Illustration of two concentric ellipses. ### 2 Ellipses Inscribed In A Circle

Illustration of 2 concentric ellipses, whose major axes are vertical, inscribed in a circle whose diameter… ### 2 Rotated Concentric Ellipses

Illustration of 2 concentric congruent ellipses that are rotated about the center at 90°. The ellipses… ### 2 Ellipses With Equal Vertical Axes

An illustration of 2 ellipses that have the equal vertical axes, but different horizontal axes. The… ### 2 Ellipses With Equal Vertical Axes

An illustration of 2 ellipses that have the equal vertical axes, but different horizontal axes. The… ### 3 Concentric Ellipses

Illustration of three concentric ellipses. ### 3 Concentric Ellipses

An illustration of 3 concentric ellipses that are tangent at the end points of the vertical axes. The… ### 3 Concentric Ellipses

An illustration of 3 concentric ellipses that are tangent at the end points of the vertical axes, which… ### 3 Concentric Ellipses

An illustration of 3 concentric ellipses that are tangent at the end points of the vertical axes. The… ### 4 Concentric Ellipses

Illustration of four concentric ellipses. ### 4 Concentric Ellipses

An illustration of 4 concentric ellipses that are tangent at the end points of the vertical axes. The… ### 4 Concentric Ellipses

An illustration of 4 concentric ellipses that are tangent at the end points of the vertical axes. The… ### 4 Concentric Ellipses

An illustration of 4 concentric ellipses that are tangent at the end points of the vertical axes, which… ### 4 Rotated Concentric Ellipses

Illustration of 4 concentric congruent ellipses that are rotated about the center at equal intervals… ### 5 Concentric Ellipses

Illustration of five concentric ellipses. ### 5 Concentric Ellipses

An illustration of 5 concentric ellipses that are tangent at the end points of the vertical axes. The… ### 5 Concentric Ellipses

An illustration of 5 concentric ellipses that are tangent at the end points of the vertical axes, which… ### 6 Concentric Ellipses

Illustration of six concentric ellipses. ### 6 Concentric Ellipses

An illustration of 6 concentric ellipses that are tangent at the end points of the vertical axes. The… ### 6 Concentric Ellipses

An illustration of 6 concentric ellipses that are tangent at the end points of the vertical axes, which… ### 8 Rotated Concentric Ellipses

Illustration of 8 concentric congruent ellipses that are rotated about the center at equal intervals… ### Ellipses Inscribed In A Circle

Illustration of concentric ellipses, whose major axes are vertical, inscribed in a circle whose diameter… ### Ellipses Inscribed In A Circle

Illustration of concentric ellipses, whose major axes are vertical, inscribed in a circle whose diameter… ### Gyroscope

A gyroscope that is rotated to form an ellipse. ### Conic Section Showing an Hyperbola

Illustration showing the definition of an hyperbola as a conic section. "The section of a right circular… ### Oval Jardiniere

An oval basket used to hold decorative plants and flowers ### Oblong Leaf

"When a leaf is bounded by a regular curve, and it three or more times as long as it is broad, it is… ### Lemniscate

A Lemniscate is, in general, a curve generated by a point moving so that the product of its distances… ### Mandorla

A Mandorla is a Vesica Piscis shaped aureola which surrounds the figures of Christ and the Virgin Mary… ### Measures of Form

Labeled shapes showing various measures of form. ### Lines of Symmetry, Oval With

Oval with dotted vertical and horizontal lines that are lines of symmetry. ### Construction of Oval

Illustration used to construct and oval when given the width. ### Polypodium Lycopodioides Owariense

A fern with short, ovate fronds.