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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Illustration showing a triangle with an exterior segment drawn to show and exterior angle. This can…

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

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

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

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

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

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