Lessons

1. Basics
2. Deductive Reasoning
3 - Parallel lines
4 - Congruent Triangles
5 - Quadrilaterals
6 - Inequalities
7 - Similar Polygon
8 - Rt. Triangles
9 - Circles
10 - Constructions
11 - Areas of 2D objects
12 - Areas and Volumes
13 - Coordinates
14 - Reflection/Rotation

Perpendicular Lines

Objective:

To know what perpendicular lines are and to be able to prove it's theorems.

Lesson 2-4 Perpendicular Lines

Perpendicular Lines : Two lines that intersect to form right angles (90º Angles). If there is an intersection with an angle begin 90º then a person can conclude that the intersection is an example of perpendicular lines

 Theorem 2-4 If two lines are perpendicular, then they form congruent adjacent angles Angle 1, Angle 2, Angle 3, and Angle 4 are all congruent adjacent angles.   Theorem 2-5 If two lines form congruent adjacent angles, then the lines are perpendicular. Angle 1, Angle 2, Angle 3, and Angle 4 are all congruent adjacent angles, therefore the lines are perpendicular. Theorem 2-6 If the exterior sides of two adjacent acute angles are perpendicular, then the angles are complimentary Angle ABD and Angle DBC are complimentary angles.

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