 ### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle. ### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow… ### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow… ### Supplementary Angles

Illustration that can be used to show supplementary angles. The angles form a straight line. ### 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 Two Tangents Drawn From an External Point

Illustration of a circle which illustrates that the tangents to a circle drawn from an external point… ### Construction of an Equal Angle Given a Point and a Straight Line

Illustration of the construction used to create an equal angle given a point in a given straight line… ### Construction to Describe a Segment of a Circle in Which an Angle Can Be Inscribed

Illustration of the construction used upon a given straight line, to describe a segment of a circle… ### Construction of a Straight Line Divided Into Equal Parts

Illustration of the construction used to divide a straight line into a given number of equal parts. ### Construction of a Straight Line Parallel to a Given Straight Line

Illustration of the construction used to create straight line parallel to a given straight line through… ### Line Equation

To find the equation of a straight line in "tangent" form. ### Horizontal Solid and Dashed Line Drawing Exercise

An exercise for mechanical drawing to construct a series of horizontal lines. The solid lines are drawn… ### Horizontal Solid Line Drawing Exercise

An exercise problem drawing a series of horizontal lines using a straight edge or triangle without using… ### 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… ### Straight Line

An illustration of a straight line/segment. ### Straight Line

Illustration of a straight line. ### Straight Line

An x=y line on a coordinate plane. ### Straight Line With Points Divided Into Equal Parts

An illustration of a straight line with 5 points dividing it into 4 equal parts. Multiple of a given… ### Straight Line With Point

An illustration of a straight line with a point. ### Intersecting Straight Lines

Illustration of two lines intersecting at a point. This can be used to show vertical angles. ### 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 From the Point C to the Extremities of the Straight line AB

Illustration showing two lines CA and CB drawn from the point C to the extremities of the straight 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… ### Lines Cut By A Transversal

Illustration showing that a transversal is a straight line that cuts two or more straight lines. ### Parallel Lines Cut By A Transversal

Illustration showing that when three or more parallel lines intercept equal parts on one transversal,… ### Parallel Lines Cut By A Transversal

Illustration showing that if two parallel lines are cut by a transversal, then the alternate interior… ### Parallel Lines Cut By A Transversal

Illustration showing that when two straight lines in the same plane are cut by a transversal, if the… ### Parallel Lines Cut By A Transversal

Illustration showing that when two parallel lines are cut by a transversal, the exterior-interior angles… ### Parallel Lines Cut By A Transversal

Illustration showing that when two parallel lines are cut by a transversal, the two interior angles… ### The Origin

A straight line through the origin of a coordinate plane. ### Construction Of A Perpendicular Bisector Of A Straight Line

Illustration of the construction used to make a perpendicular bisector of a straight line. ### Construction Of A Perpendicular To A Straight Line

Illustration of the construction used to create a perpendicular to a straight line at a given point. ### Construction Of A Perpendicular To A Straight Line

Illustration of the construction used to create a perpendicular to a straight line from a given point… ### Positioning Pen with the Straight Edge

To draw a straight line, the pen must be perpendicular with the straight edge ruler, as shown in A.… ### Section Liner, A Draftsman's Tool

"A draftsman's instrument for ruling parallel lines. It consists of a triangle so attached to a straight-edge… ### Triangle With Segment Extended for Exterior Angle

Illustration showing a triangle with an exterior segment drawn to show and exterior angle. This can… ### Triangle With Interior Segment

Illustration showing a triangle with an interior segment drawn