1. Geometry Ch 1.1 Notes
Conjecture – is an unproven statement that is based on observation
Inductive Reasoning – is a process used to make conjectures by looking at patterns
Counterexample – is an example that show a conjecture is false

2. Geometry Notes Ch 1.2
Undefined Terms – we just describe them Point – has no dimension, represented by a small dot, (position in space) Line – extends in one dimension, represented by a straight line with arrows on each end Plane – extends in two dimensions, represented by a parallelogram

3. Point Plane Ray Opposite Rays Line Line Segment

4. Definitions Collinear Points – are points all on the same line Coplanar Points – are points all of the same plane Intersect – if two or more figures have one or more points in common Intersection – is the set of points the figures have in common

5. Geometry Ch 1.3 Notes
Postulates or Axioms – are rules that are accepted without proof Theorems – are rules that have been proven Lengths are equal Segments are congruent AB = AD AB = AD “is equal to” “is congruent to”

6. Postulate 1 – without the bar means length AB with the bar means line segment. The distance between two points is the absolute value of the difference of the coordinates. Postulate 2 – Segment Addition Postulate

7. Distance Formula - Pythagorean Theorem -

8. Geometry Ch 1.4 Notes
Angle – consists of 2 different rays that have the same initial point Measures are equal Angles are congruent

9. Postulate 4 – Angle Addition Postulate Classifying angles by their measure Acute angle – Right angle – Obtuse angle – Straight angle –

10. Adjacent Angles – are 2 angles that share a common vertex and side, but do not have any common interior points in common

11. Geometry Ch 1.5 Notes
Midpoint – is the point that divides a segment in half Bisect – means to cut into two equal parts Midpoint Formula – Angle Bisector -

12. Geometry Ch 1.6 Notes
Vertical Angles – are 2 angles whose sides are opposite rays of each other. Linear Pair – 2 adjacent angles whose noncommon sides are opposite rays Complementary Angles – Supplementary Angles -

13. Geometry Ch 1.7 Notes
Square - P = A = Rectangle – P = Triangle - P = Circle - C =