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### Alternate Exterior Angles

Angles that lie outside a pair of lines and on opposite sides of a transversal.

### Alternate Exterior Angles Converse

if two lines are cut by a transversal so that the alternate exterior angles are congruent, then the lines are parallel

### Alternate Interior Angles Converse

if two lines are cut by a transversal so that alternate interior angles are congruent, then the lines are parallel

### Alternate Interior Angles Theorem

if two parallel lines are cut by a transversal, then the pairs of alternate interior angles are congruent

### Base Angles Theorem

if two sides of a triangle are congruent, then the angles opposite them are congruent

### Congruent Complements Theorem

if two angles are complementary to the same angle (or to congruent angles) then the two angles are congruent

### Congruent Supplements Theorem

if two angles are supplementary to the same angle (or to congruent angles) then they are congruent

### Construction

drawing a figure satisfying certain conditions as part of solving a problem or proving a theorem

### Consecutive Interior Angles

angles that are on the same side of the transversal and inside the two lines

### Consecutive Interior Angles Converse

if two lines are cut by a transversal so that consecutive interior angles are supplementary, then the lines are parallel

### Legs of a Right Triangle

in a right triangle the sides that form the right angle are called legs of the right triangle. the side opposite the right angle is the hypotenuse of the triangle

### Magnitude of a vector

AB is the distance from the initial point A to the terminal point B, and is written |AB|

### Ruler

measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths

### Perpendicular Transversal

if a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other.

### Straightedge

hand tool consisting of a flat rigid rectangular bar (metal or wood) that can be used to draw straight lines (or test their straightness)

### Undefined Term

A basic figure that is not defined in terms of other figures. The undefined terms in Geometry are point, line, and plane.

### Remote Interior Angles Theorem

the exterior angles of a triangle euquals the sum of the 2 remote interior angles.

### Rotation

(mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin

### Translation

(mathematics) a transformation in which the origin of the coordinate system is moved to another position but the direction of each axis remains the same

### vector

a straight line segment whose length is magnitude and whose orientation in space is direction

### Verticle Angle

formed by 2 intersecting like and are opposites of each other which means angles are congruent