Illustrations of a circle with segment, semicircle, sector, quadrant, and central angles drawn.
Illustrations of a circle with arc, chord, inscribed angle, and circumscribed about a polygon.
Illustrations of a circle with a circumscribed polygon. Or, a circle inscribed in an octagon.
Illustration of a circle with diameter and chord drawn. A diameter perpendicular to a chord bisects…
Illustration of a circle with equal chords, which are equally distant from the center.
Illustration of a circle with unequal chords, which are unequally distant from the center.
Illustration of a circle with a tangent drawn - a straight line perpendicular to a radius at its extremity.
Illustration of a circle with parallels intercepting equal arcs on a circumference.
Illustration of a circle which illustrates that through three points not in a straight line one circumference,…
Illustration of a circle which illustrates that the tangents to a circle drawn from an external point…
Illustration of two circles that are tangent to each other, the line of center passing through the point…
Illustration of a circle with a polygon (octagon) and square inscribed.
Illustration of equal circles to show that two central angles have the same ratio as their intercepted…
Illustration of equal circles to show that an inscribed angle is measured by half the arc intercepted…
Illustration of a circle with a right angle inscribed in a semicircle.
Illustration of a circle with an angle inscribed in a segment greater than a semicircle, an acute angle.
Illustration of a circle with an angle inscribed in a segment less than a semicircle, an obtuse angle.
Illustration of a circle with two intersecting chords within the circumference. The angle formed is…
Illustration of a circle showing an angle included by a tangent and a chord drawn from the point of…
Illustration showing angles formed by two secants, two tangents, or a tangent and a secant, drawn to…
Illustration showing arcs measured in positive and negative angles.
Illustration showing various circles and the angles formed by intersecting lines.
Illustration showing a circle with a diameter, radius, and segment drawn.
Illustration showing a circle with a diameter, radius, lines, triangle, and segment drawn.
Illustration showing a circle with various chords and tangents drawn.
Illustration showing a circle with various chords and tangents drawn.
Illustration showing 2 circles with that touch each other and two lines drawn through the point of contact…
Illustration showing 2 intersecting circles with a line drawn through each point of intersection terminated…
Illustration showing 2 intersecting circles with a lines drawn that form a triangle.
Illustration showing the diameter of a circle inscribed in a right triangle is equal to the difference…
Illustration showing an equilateral triangle inscribed in a circle.
Illustration showing a circle with an inscribed and circumscribed quadrilateral.
Illustration showing a circle with an inscribed quadrilateral and triangles formed by extended chords.
Illustration of the construction used to circumscribe a circle about a given triangle.
Illustration of the construction used to inscribe a circle in a given triangle.
Illustration of the construction used to escribe circles with centres (centers) called ex-centres of…
Illustration of the construction used to draw a tangent to a given circle through a given point.
Illustration of the construction used upon a given straight line, to describe a segment of a circle…
Illustration used to construct a circle when given two points that it passes through and a radius.
Illustration showing a line with a midpoint drawn from a given exterior point to a given circumference.
Illustration showing a line that remains parallel to a given line, and touches at one end a given circumference.
Illustration showing a line that moves so that its ends constantly touch two fixed lines which are perpendicular…
Illustration showing a circle with an inscribed triangle and radii.
Illustration showing a circle with equilateral triangles and another circle within.
Illustration used to construct a common tangent when given two circles.