### 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 Bisecting Trapezoid Sides

Illustration used to prove the theorem "The line bisecting one of the non parallel sides of a trapezoid…

### Triangle With Segments

Triangle with segments drawn.

### 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 Bisectors of Base Angles

Illustration to show if the bisector of the base angles of a triangle are drawn, and through their point…

### 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…

### 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…

### 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.

### 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.

### Drawing a Vertical Line

Vertical lines are drawn by using a triangle held against the T-square.

### Sketching Vertical Line

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