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…
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…
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.
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…
Perpendicular Line Drawn From Point P to Line RS
A perpendicular line drawn from point P to straight line RS.
Locus Point to a Plane
"The locus of a point in space equidistant from the extremities of a straight line is the plane perpendicular…
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. "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…
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 perpendicular to a line (AB). "A straight line perpendicular to one of two parallel…
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.
Quadrilateral with Symmetry
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…
!["Fleming's rule for direction of induced current. Extend the thumb, forefinger and middle finger of the right hand [as shown]. Place the hand [so that] the thumb will point in the direction in which the conductor moves, the forefinger in the direction of the lines of force (N to S), then will the middle finger point in the direction in which the induced current flows." -Hawkins, 1917](https://etc.usf.edu/clipart/35600/35677/induc_35677_mth.gif)
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.
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…