Straight line

### Straight Line

Illustration of a straight line.

### 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…

### Parallel Lines With Equal Segments Between

Illustration of two parallel lines with equal segments between them. Two parallel lines are everywhere…

### Projections of a Lines

Projections of a lines parallel to ground line.

### 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…

### Vanishing Point Using Lines

An exercise problem to create a vanishing point using lines. The line is drawn by placing a dot into…

### Tracing magnetic field lines

"Tracing lines of force with a suspended magnet." -Hawkins, 1917

### Magnetic Field

"Experiment showing lines of force in the magnetic field surrounding a conductor carrying an electric…

### Marking Gauge

A marking gauge is used in woodworking and metalworking to mark out lines for cutting or other operations.…

### Maxwell's Corkscrew Rule

"Illustrating Maxwell's 'corkscrew rule' for relative directions of current and lines of force...a current…

### Lines of Symmetry, Oval With

Oval with dotted vertical and horizontal lines that are lines of symmetry.

### Parabola Second Method

Draftsman's second method for drawing a parabola

### Construction Of A Parallel Line

Illustration of the construction used to create a line parallel to a given line.

### Parallel Lines Cut By a Perpendicular And Transversal

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

### Modern Pattern

The modern pattern has curved lines.

### Perpendicular Line Drawn From Point P to Line RS

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

### Plane Determined by 2 Intersecting Lines

Illustration of a plane determined by 2 intersecting lines

### Line Projected Upon Plane

Illustration of a straight line projected upon a plane.

### Locus Point to a Plane

"The locus of a point in space equidistant from the extremities of a straight line is the plane perpendicular…

### Oblique Lines Drawn to a Plane

Oblique lines drawn from a point to a plane.

### Plane Determined by 2 Parallel Lines

Illustration of a plane determined by 2 parallel lines

### Line Perpendicular to Plane

If a straight line is perpendicular to each of two other straight lines in a plane at their point of…

### Line Perpendicular to Plane

Straight line AB is perpendicular to the lines in plane MN at point B.

### Line Perpendicular to Plane

Straight line AB is perpendicular to the lines in plane MN at point B. "If from the foot of a perpendicular…

### Lines Perpendicular to Plane

Two straight lines, AB and CD, perpendicular to the same plane (MN) are parallel.

### Plane Passed Perpendicular To A Given Plane

"Through a given line oblique to a plane, one, and only one plane, can be passed perpendicular to the…

### Plane Rotated About a Straight Line

Illustration of a plane rotated about a straight line.

### Intersecting Planes

The intersection of two planes is a straight line.

### Intersecting Planes

The intersection of two planes is a straight line.

### Intersecting Planes

The intersection of two planes is a straight line.

### Intersecting Planes

The intersection of two planes is a straight line.

### Intersecting Planes

Two intersecting planes on a third plane. "If two intersecting planes are each perpendicular to a third…

### Parallel Planes

Illustration of two parallel planes. "Two planes perpendicular to the same straight line are parallel."

### Parallel Planes

Two parallel planes cut by a third plane.

### Parallel Planes

Two parallel planes perpendicular to a line (AB). "A straight line perpendicular to one of two parallel…

### Parallel Planes Cut By 2 Lines

Three parallel planes cut by two lines.

### Projection of a Line Segment

CD is the projection of AB upon OX. In each case AE=CD and AE=ABcos theta.

### Axis of Symmetry Drawn on a Quadrilateral

Illustration of an axis of symmetry drawn with respect to a quadrilateral.

Illustration of a quadrilateral which has two adjacent sides equal and the other two sides equal. It…

### Ratlines

One of a series of small ropes or lines which transverse the shrouds horizontally, thus forming steps…

### Right Hand Rule of Induced Current

"Fleming's rule for direction of induced current. Extend the thumb, forefinger and middle finger of…

### Satellite

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

### Definitions, Segment, Ray, Line

Illustrations of a segment, a ray, and a line that can be used when providing definitions.

### Semicircle

Semicircle with line drawn perpendicular to the diameter.

### Sable Shield

A heraldic shield with a black surface, which is shown by the crossing horizontal and vertical lines.

### Line, Slanted

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

### Line, Slanted

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

### Line, Slanted

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