1. Geometry

2. Definitions

3. Geometry Definitions 1.straight angle - 180º

4. Geometry Definitions 1.straight angle - 180º 2.right angle - 90º 3.perpendicular lines – intersect to form right angles

5. Geometry Definitions 1.straight angle - 180º 2.right angle - 90º 3.perpendicular lines – intersect to form right angles 4.parallel lines – never intersect

6. Geometry Definitions 1.straight angle - 180º 2.right angle - 90º 3.perpendicular lines – intersect to form right angles 4.parallel lines – never intersect 5.transversal – intersects both of a pair of parallel lines

7. Geometry Pairs of Angles (Congruent)

8. Geometry Pairs of Angles (Congruent) 1.vertical angles – across from each other in a pair of intersecting lines

9. Geometry Pairs of Angles (Congruent) 1.vertical angles – across from each other in a pair of intersecting lines 2.corresponding angles – in the same location in regards to the parallel line and the transversal

10. Geometry Pairs of Angles (Congruent) 1.vertical angles – across from each other in a pair of intersecting lines 2.corresponding angles – in the same location in regards to the parallel line and the transversal 3.alternate interior angles – on different sides of the transversal inside the parallel lines

11. Geometry Pairs of Angles (Congruent) 1.vertical angles – across from each other in a pair of intersecting lines 2.corresponding angles – in the same location in regards to the parallel line and the transversal 3.alternate interior angles – on different sides of the transversal inside the parallel lines 4.alternate exterior angles – on different sides of the transversal outside the parallel lines

12. Geometry Pairs of Angles (Not Congruent)

13. Geometry Pairs of Angles (Not Congruent) 1.supplementary – add up to 180º

14. Geometry Pairs of Angles (Not Congruent) 1.supplementary – add up to 180º 2.complementary – add up to 90º