### Line, Slanted

A line with arrows on both ends to show that it extends indefinitely. The line is slanting down when…

### Segment, Slanted Line

Illustration of a slanted line segment. A line segment is a section of a line with definite endpoints.

### Segment, Slanted Line

Illustration of a slanted line segment. A line segment is a section of a line with definite endpoints.

### Segment, Slanted Line

Illustration of a slanted line segment. A line segment is a section of a line with definite endpoints.…

### Segment, Slanted Line

Illustration of a slanted line segment. A line segment is a section of a line with definite endpoints.…

### Effect of a metal core in a solenoid

"Illustrating the effects of introducing an iron core into a solenoid. In the upper firgure, the air…

### Spiral Drawn on Piece of Paper Shown Flat

Spiral with lines AB and CD drawn on piece of paper shown flat.

### Spiral Drawn on Piece of Paper and Rolled

Spiral with lines AB and CD drawn on piece of paper and rolled into a cylinder to form spiral running…

### Lines of Symmetry, Square With

Square with dotted vertical, horizontal, and diagonal lines that are lines of symmetry.

### Square With Diagonals and Lines Drawn

Illustration showing a square with diagonals, lines, and parallel lines

### Parallel To Straight Line Construction

Illustration used to show how to draw a straight line parallel to a straight line through a given point.

### Perpendicular To Straight Line Construction

Illustration used to show how to draw a perpendicular to a straight line from a given point on the line…

### Perpendicular To Straight Line Construction

Illustration used to show how to draw a perpendicular to a straight line from a given point on the line…

### Perpendicular To Straight Line Construction

Illustration used to show how to draw a perpendicular to a straight line from a given point that is…

### Perpendicular To Straight Line Construction

Illustration used to show how to draw a perpendicular to a straight line from a given point that is…

### Bisect A Straight Line

Illustration used to show how to bisect a straight line.

### Area of Surface Generated by a Straight Line

Diagram used to prove the theorem: "The area of the surface generated by a straight line revolving about…

### Survey of Lake Front in Chicago

Illustration showing a survey on the lake front in Chicago with distances and angle measures shown.

### Axis of Symmetry

Illustration of an axis of symmetry drawn with respect to a straight line.

### Three Person File Military Formation

An illustration of a three person file military formation.

### 2 Lines Cut By A Transversal

Illustration of two straight lines cut by a transversal. The 8 angles formed are labeled.

### 2 Lines Cut By A Transversal

Illustration of two straight lines, m and n, cut by a transversal t.

### 2 Lines Cut By A Transversal

Illustration of two straight lines, AB and CD, cut by a transversal EF.

### Line of Symmetry, Tree With

Tree with dotted vertical line that shows symmetry.

### Symmetry, Tree With No

Tree that has no symmetry.

### Triangle With Segments

Triangle with segments drawn.

### Lines of Symmetry, Triangle With

Square with dotted lines that are lines of symmetry.

### Altitudes In A Triangle

Illustration used to show "The altitudes of a triangle are concurrent."

### Angle Bisectors In A Triangle

Illustration used to prove "The bisectors of the angles of a triangle are concurrent in a point which…

### Triangle With Bisector Parallel to the Base

Illustration of a triangle showing that when a line parallel to the base of a triangle bisects one side,…

### Construction Of Triangle

Illustration used to show how to draw a triangle when given two sides and the included angle of the…

### Triangle With Lines From the Vertices That Join a Point Within

Illustration to show lines drawn from the vertices to join at a point within the triangle.

### Medians In A Triangle

Illustration used to show "Any two medians of a triangle intersect each other in a trisection point…

### Perpendicular Bisectors In A Triangle

Illustration used to prove "The perpendicular bisectors of the sides of a triangle are concurrent in…

### 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

### Triangular City Block With Angles and Lengths

Illustration showing an angle of 23 degrees 40 minutes making a triangle in a city block and marking…

### Two Person File Military Formation

An illustration of a two person file military formation.

### Vector

OP is a line representing a vector (directed quantity)

### Vector Showing Force at Angle of 20 degrees

OP is a vector (directed quantity) showing the force by a weight acting on it at an angle of 20 degrees.

### Vert Shield

A heraldic shield with a green (vert) surface, represented by the diagonal lines drawn from the top…

### Line, Vertical

A vertical line with arrows at both ends to show that it extends indefinitely.

### Line, Vertical

A vertical line with arrows at both ends to show that it extends indefinitely.

### Segment, Vertical Line

Illustration of a vertical line segment. A line segment is a section of a line with definite endpoints.

### Segment, Vertical Line

Illustration of a vertical line segment. A line segment is a section of a line with definite endpoints.…

### Sketching Vertical Line

Vertical line is drawn downward with the pencil held with freedom, not close to the point.