Illustration used to show that "If two tangents are drawn from any given point to a circle, those tangents…

Illustration used to show that "A tangent to a circle is perpendicular to the radius drawn to the point…

Illustration of a circle with diameter AB. Radii are RO, SO, AO, and BO. ED is a chord.

Illustration of a circle with diameter BC, chord DF, secant MN, and tangent HK.

An illustration showing a quadrilateral inscribed in a circle that is tangent to a line.

An illustration showing a triangle with angles A, C, and D inscribed in a circle which is tangent to…

Illustration of a circle which illustrates that the tangents to a circle drawn from an external point…

Illustration showing a circle with various chords and tangents drawn.

Illustration showing a circle with various chords and tangents drawn.

Illustration showing angles formed by two secants, two tangents, or a tangent and a secant, drawn to…

Illustration showing 2 circles with that touch each other and two lines drawn through the point of contact…

Illustration of a plane tangent to a cone which contains one element of the cone but does not cut the…

Illustration used to construct a common tangent when given two circles.

Illustration of the construction used to draw a tangent to a given circle through a given point.

Illustration showing that tangents drawn at the ends of any diameter are parallel to each other.

Illustration showing the tangents drawn at two corresponding points of an ellipse and its auxiliary…

Illustration used to show how "to construct a common external tangent to two given circles."

Illustration used to show how to construct two common external tangents to two given circles.

Illustration showing that the area of a parabolic segment made by a chord is two thirds the area of…

Illustration showing that if two tangents RP and RQ are drawn from a point R to a parabola, the line…

Diagram used to prove the theorem: "A plane perpendicular to a radius at its extremity is tangent to…

"Nodal Cubic, with four primary lines and their satellite. In the diagram, ABC is the satellite line.…

Illustration used to show how "to construct a tangent to a circle from a point outside."