 ### Arc and Chord in Circle

Illustration of circle with arc and chord. ### Area of a Circle by parts

Illustration of circle with parts drawn to show area. ### Area of Circle

Illustration of a circle with squares drawn to demonstrate area. ### Circle With Center o and Radius r with point P

Circle modeling the earth. O is the center of the earth, r the radius of the earth, and h the height… ### Center of a Circle

Illustration used to find the center of a circle. ### Central Angle in a Circle

Illustration of a circle with central angle AOB. ### Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured… ### Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured… ### Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured… ### Circle With Chord and Tangent

Illustration of a circle showing an angle included by a tangent and a chord drawn from the point of… ### Circle with Chord and Triangle

Illustrations of a circle with a chord and triangle inside. ### Chord of Circle

Illustration of a circle with the chord eb drawn and labeled. ### Circle With a Chord of 2 ft. and a Radius of 3 ft.

Circle with chord AB=2 ft. and radius OA = 3 ft.. Triangle AOC is a right triangle. Angle AOC=half angle… ### Circle With Intersecting Chords

Circle with intersecting chords. ### Chords, Diameters, and Radii of a Circle

Illustration of a circle with diameter AB. Radii are RO, SO, AO, and BO. ED is a chord. ### Chords, Secants, Diameters, and Tangents of a Circle

Illustration of a circle with diameter BC, chord DF, secant MN, and tangent HK. ### Circle With Circumference Through Three Points

Illustration of a circle which illustrates that through three points not in a straight line one circumference,… ### Circle with Circumscribed Polygon

Illustrations of a circle with a circumscribed polygon. Or, a circle inscribed in an octagon. ### Common Form of Circle

A circle in its common, or central form. This is used to assist students in finding the equation of… ### Conic Section Showing A Circle

Illustration showing the definition of a circle as a conic section. The section of a right circular… ### Conic Section Showing A Circle

An illustration showing the intersection of a plane and a cone. The cone is intersected by a plane parallel… ### Decagon Circumscribed About A Circle

Illustration of a decagon circumscribed about a circle. This can also be described as a circle inscribed… ### Decagon Inscribed In A Circle

Illustration of a decagon inscribed in a circle. This can also be described as a circle circumscribed… ### Circle With Diameter and Chord

Illustration of a circle with diameter and chord drawn. A diameter perpendicular to a chord bisects… ### Diameter Perpendicular to a Chord in a Circle

Illustration used to show that "The diameter perpendicular to a chord bisects the chord and also its… ### Circle With Diameter, Radius, Segment

Illustration showing a circle with a diameter, radius, and segment drawn. ### Circle With Diameter, Radius, Segment, Line

Illustration showing a circle with a diameter, radius, lines, triangle, and segment drawn. ### Diameters of a Circle

Illustration of a circle with two intersecting diameters. ### Divided Circle

A circle divided evenly by a dotted line. ### Dodecagon Circumscribed About A Circle

Illustration of a dodecagon circumscribed about a circle. This can also be described as a circle inscribed… ### Dodecagon Inscribed In A Circle

Illustration of a dodecagon inscribed in a circle. This can also be described as a circle circumscribed… ### Circle With Equal Chords

Illustration of a circle with equal chords, which are equally distant from the center. ### Find The Center Of A Circle Through 3 Points

An illustration showing how to find the center of a circle which will pass through three given points… ### Hexagon In A Circle

Illustration of a hexagon in a circle. Four of the six vertices of the hexagon are bound by the circle… ### Hexagon Inscribed in Circle

Illustration of hexagon inscribed in circle. Or, circle circumscribed about hexagon. ### Circle With Inscribed Angle Greater Than Semicircle

Illustration of a circle with an angle inscribed in a segment greater than a semicircle, an acute angle. ### Inscribed Angle in a Circle

Illustration of a circle with an inscribed angle. ### Circle With Inscribed Angle Less Than Semicircle

Illustration of a circle with an angle inscribed in a segment less than a semicircle, an obtuse angle. ### Circle Inscribed in a Right Triangle

Illustration showing the diameter of a circle inscribed in a right triangle is equal to the difference… ### Circle With Inscribed Right Angle in Semicircle

Illustration of a circle with a right angle inscribed in a semicircle. ### Circle With Triangles and Circle Within

Illustration showing a circle with equilateral triangles and another circle within. ### Involute of Circle

"A circle may be conceived as a polygon of an infinite number of sides. Thus to draw the involute of… ### Nonagon Inscribed in a Circle

Illustration of a regular nonagon inscribed in a circle. This could also be described as a circle circumscribed… ### Circle With Parts

Circle with diameter, radius, arc, chord, and arc. ### Parts of Circle

Illustration of circle with arc, chord, diameter and radius. ### Pentagon Inscribed in Circle

Illustration of pentagon inscribed in circle. Or, circle circumscribed about pentagon. ### Circle With Perpendicular Diameters

Illustration of circle with perpendicular diameters. ### Circle With Perpendicular Diameters

Illustration of circle with perpendicular diameters. ### Circle With a Perpendicular Drawn to the Diameter

"If from any point on the circumference of a circle, a perpendicular be let fall upon a given diameter,… Illustration of polygon circumscribed about circle. Or, circle inscribed in the polygon. ### Polygon Inscribed in Circle

Illustration of polygon inscribed in circle. Or, circle circumscribed about the polygon. ### Quadrant of Circle With 60 degree Arc

Illustration of circle with quadrant and 60 degree arc. Illustration of a quadrilateral circumscribed about a circle. This could also be described as a circle… Illustration showing a circle with a quadrilateral inscribed. ### Quadrilateral Inscribed In A Circle

An illustration showing a quadrilateral inscribed in a circle that is tangent to a line. ### Circles With Radius 4000 and Enclosed Triangle

Illustration of circle with radius of 4000, and triangle with 45 degree angle enclosed. Illustration of a circle with the radius OA drawn and labeled.  