 ### Intersecting Lines, 2 Perpendicular

2 intersecting lines, one of which is vertical and one of which is horizontal. The intersection forms… ### Bisected Angle

Illustration to show that if an angle is bisected, and if a line drawn through the vertex perpendicular… ### Bisected Angles

Illustration to show that the bisectors of two supplementary adjacent angles are perpendicular to each… ### Bisected Angle

Illustration to show that the bisector of one of two vertical angles bisects the other. ### Bisected Angles

Illustration to show that the bisector of two pairs of vertical angles formed by two intersecting lines… ### Bisected Vertical Angle of an Isosceles Triangle

Illustration to show that the bisector of the vertical angle of an isosceles triangle bisects the base,… ### Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point in its bisector… ### Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point not in its… ### Right Angles With Same Vertex

An illustration showing when one straight line meets another straight line and makes the adjacent angles… ### Angles Used to Illustrate Sum and Difference of Two Angles

Angles used to illustrate the sum and difference of two angles and trig identities. ### Supplementary and Right Angles

Illustration showing angles 1 and 2 are supplementary and angles ACD and DCB are supplementary. Also,… ### Bisect A Line

Method to draw the bisector of a line ### Tangent to Perpendicular Radius Circle Theorem

Illustration used to show that "A tangent to a circle is perpendicular to the radius drawn to the point… ### Circle With Tangent Line Drawn

Illustration of a circle with a tangent drawn - a straight line perpendicular to a radius at its extremity. ### Projection Of Cone

Illustration of the projection of a cone that is rightly inclined. ### Construction of Bisecting a Given Line

Illustration of the construction used to bisect a given line. ### Construction of Perpendicular Upon a Given Line From an External Point

Illustration to let fall a perpendicular upon a given line from a given external point. ### Construction of Perpendicular From a Given Point on a Straight Line

Illustration of the construction of a perpendicular to a line when given a point O on the straight line. ### Construction of Perpendicular From a Given Point on a Straight Line

Illustration of the construction of a perpendicular to a line when given a point B on the straight line. ### Coordinate Axis With Angles, Lines, and Perpendiculars Drawn

Coordinate axis with angle XOP equal to theta, Θ, and angle XOQ=180 - Θ. From any point in the terminal… ### Coordinate Axis With Perpendiculars Drawn To Form Similar Right Triangles From Positive and Negative Theta, Θ

Angle XOP=Θ and angle XOQ=- Θ. From a point in the terminal side of each a perpendicular line is drawn… ### Coordinate Axis With Perpendiculars Drawn To Form Similar Right Triangles

Angle XOP=Θ and angle XOQ=90+Θ. From a point in the terminal side of each a perpendicular line is… ### Intersecting Lines Corollary

Illustration used to prove the corollary that "Two lines perpendicular respectively to two intersecting… ### Perpendicular to Line Corollary

Illustration used to prove the corollary that "From a point outside a line there exists only one perpendicular… ### Projection Of Cylinder

Illustration of the projection of a cylinder that is rightly inclined. ### Earth's Axis Perpendicular to Plane of Orbit

"The earth shown as it would be if its axis were perpendicular to the plane of the orbit." -Wiswell,… ### Ellipse Fifth Method

Draftsman's fifth method for drawing an ellipse ### Ellipse Fourth Method Case 1

Draftsman's fourth method for drawing an ellipse, case 1 ### Ellipse Fourth Method Case 2

Draftsman's fourth method for drawing an ellipse, case 2 ### Flashcard of a math symbol for Perpendicular

A flashcard featuring a math symbol for Perpendicular ### Flashcard of Perpendicular Lines

A flashcard featuring an illustration of Perpendicular Lines ### Perpendicular Form

A line on the coordinate plane showing evidence of "perpendicular" form. ### Gules Shield

A heraldic shield with a red (gules) surface, which is represented by the perpendicular lines, drawn… ### Projection Of Hexagonal Pyramid

Illustration of the projection of a hexagonal pyramid that is in a right position. ### Illumination of a Surface When the Surface is not Perpendicular to the Source

Illustration modeling the illumination on a surface when the surface is not perpendicular to hte rays… Illustration of an extension ladder. If ladder is leaned against a building, it will form a right triangle… Illustration of a ladder that is not perpendicular to the ground. If it is set on the ground and leaned… Illustration of a ladder that is not perpendicular to the ground. If it is set on the ground and leaned… Illustration of a ladder that is not perpendicular to the ground. If it is set on the ground and leaned… Illustration of a ladder that is not perpendicular to the ground. If it is set on the ground and leaned… ### Ladder Leaning Against a Building

Illustration of a ladder leaning against the side of a building (wall) to form a right triangle . ### Ladder Leaning Against a Tree

Illustration of a ladder leaning against a palm tree, that is perpendicular to the ground, to form a… ### Ladder Leaning Against a Tree

Illustration of a ladder leaning against a palm tree, that is perpendicular to the ground, to form a… ### Ladder Leaning Against a Tree

Illustration of a ladder leaning against a palm tree, that is perpendicular to the ground, to form a… ### Ladder Leaning Against a Tree

Illustration of a ladder leaning against a palm tree, that is perpendicular to the ground, to form a… ### 2 Ladders Leaning Against a Tree

Illustration of 2 ladders leaning against opposite sides of a palm tree to form similar right triangles.… ### 3 Ladders Leaning Against a Wall

Illustration of 3 ladders leaning against the side of a building (wall) to form right triangles. The… ### Lemniscate

A Lemniscate is, in general, a curve generated by a point moving so that the product of its distances… ### Circle Made by Ends of a Line Touching Two Fixed Lines Perpendicular to Each Other

Illustration showing a line that moves so that its ends constantly touch two fixed lines which are perpendicular… ### Perpendicular Line Drawn To a Given Line From an External Point

Illustration showing that the perpendicular is the shortest line that can be drawn to a straight line… ### Projections of a Line

Projections of a line perpendicular to a plane. ### Lines Drawn From the Same Point in a Perpendicular to a Given line, Cutting Off Segments

Illustration showing two straight lines drawn from the same point in a perpendicular to a given line,… ### Lines Drawn to Another Line to Form Triangle

Illustration of two straight lines drawn from a point in a perpendicular to a given line, cutting off… ### Perpendicular Line Drawn to a Given Line from an External Point

Illustration showing only one perpendicular can be drawn to a given line from a given external point. ### Parallel Lines

Illustration showing two straight lines in the same plane perpendicular to the same straight line are… ### Parallel Lines

Illustration showing if a straight line is perpendicular to one of two parallel lines, it is perpendicular… ### Parabola Second Method

Draftsman's second method for drawing a parabola ### Parallel Lines Cut By a Perpendicular And Transversal

Illustration showing two parallel vertical lines cut by a perpendicular line and a transversal. Congruent… ### Penmanship

The correct position when the pen is at the bottom of an extended letter below the line, the pen being,… ### Perpendicular Line Drawn From Point P to Line RS

A perpendicular line drawn from point P to straight line RS.