### 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…

### Polyhedral Angle

Illustration of polyhedral angle. "The opening of three or more planes which meet at a common point…

### Straight Angle

An illustration showing a straight angle. When the sides of an angle extend in opposite directions,…

### Trihedral Angle

Trihedral angle. "The sum of any two face angles of a trihedral angle is greater than the third face…

An illustration of two angles that are adjacent. They have the same vertex and a common side between…

### Two Equal Dihedral Angles

Illustration of 2 equal dihedral angles.

### Equal Dihedral Angles

Illustration of 3 equal dihedral angles. "Two dihedral angles have the same ratio as their plane angles."

### Equal Polyhedral Angles

Illustration of two polyhedral angles that are equal.

### Equal trihedral angles

Illustration used to show that two trihedral angles are equal or symmetrical when the three face angles…

### Right Angles With Same Vertex

An illustration showing when one straight line meets another straight line and makes the adjacent angles…

### Angles With Same Vertex

An illustration of angles with the same vertex made up of 4 lines.

### Symmetrical Polyhedral Angles

Illustration of two symmetrical polyhedral angles.

### Vertical Angles

Vertical angles are when two angles have the same vertex, and the sides of the one are prolongations…

### Vertical Dihedral Angles

Illustration of two vertical dihedral angles.

### Approximate Ellipse using Lines

"When the minor axis is at least two-thirds the major, the following method ma be used: Make CF and…

### Distribution of Magnetic Lines, Ring Armature

"Distribution of magnetic lines through a ring armature. Since the lines follow the metal of the ring…

### Barry Bendy

"Formed by lines drawn horizontally, crossed by others drawn diagonally."—Aveling, 1891

### Paly Bendy

"Produced by lines drawn vertically, by others drawn diagonally, or by a compound of Paly and Bendy."—Aveling,…

### Line, Broken

A zig zag line known as a broken line in mathematics.

### Line, Broken

A zig zag line known as a broken line in mathematics.

### Line, Broken

A zig zag line known as a broken line in mathematics.

### Line, Broken

A zig zag line known as a broken line in mathematics.

### Circle With Diameter, Radius, Segment, Line

Illustration showing a circle with a diameter, radius, lines, triangle, and segment drawn.

### 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 Triangle and Radii

Illustration showing a circle with an inscribed triangle and radii.

### Circle With Various Chords

Illustration showing a circle with various chords drawn.

### Circle With Various Chords

Illustration showing a circle with various chords drawn.

### Circle With Various Chords And Tangents

Illustration showing a circle with various chords and tangents drawn.

### Circle With Various Chords And Tangents

Illustration showing a circle with various chords and tangents drawn.

### Circle With a Right Triangle

Illustration where one leg of a right triangle is the diameter of a circle. The tangent at the point…

### Circle With a Tangent Line and Chord

Illustration showing that from any point in the circumference of a circle, a chord and a tangent are…

### Two Intersecting Circles With Lines

Illustration showing 2 intersecting circles with a line drawn through each point of intersection terminated…

### Two Intersecting Circles With Lines

Illustration showing 2 intersecting circles with a lines drawn that form a triangle.

### Tangent Circles With Chords

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

### Spherical Cone

"If a sector revolves about its bounding radius as an axis, it generates what may be called a spherical…

### Construction of Bisecting a Given Angle

Illustration of the construction used to bisect a given angle.

### Construction of Bisecting a Given Arc

Illustration of the construction used to bisect a given arc.

### Construction of Bisecting a Given Line

Illustration of the construction used to bisect a given line.

### 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 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.

### 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…

### Curve Inked with Circle Arcs

"Any noncircular curve may be approximated by tangent circle arcs, selecting a center by trial, drawing…

### Line, Curved

A curved line with endpoints.

### Line, Curved

A curved line with endpoints. This illustration resembles a parabola.

### Line, Curved

A curved line with endpoints.

### Line, Curved

A curved line with endpoints.

### Line, Curved

A curved line with endpoints.

### Line, Curved

A curved line with endpoints.

### Line, Curved

A curved line with endpoints.

### Line, Curved

A curved line with endpoints.

### Line, Curved

A curved s-shaped line.

### Projection of a Curved Line

Illustration of a projection of a curved line.

### Line, Curved Wavy

A curved wavy line.

### Drawing Irregular Isometric Curves of Solid

The illustration of an irregular curves for solid. The isometric projection of the curve can be drawn…

### Angle of Depression

Illustration showing an angle of depression from a horizontal line to a line of sight.

### Construction Of Dividing A Line

Illustration used to show how to divide a given straight line into required number of equal parts.