1. BUILDING BLOCKS OF GEOMETRY WOOOOOOT!

2. GEO-METRY ◦Geo=earth ◦Metry=measure

3. Building Blocks of Geometry ◦Undefined Terms ◦“It’s kinda like…” ◦Point ◦Line ◦Plane ◦Defined Terms ◦Defined using undefined terms

4. Undefined Terms Point Plane Line

6. Defined Terms ◦Some defined terms are pretty obvious ◦Coplanar, collinear, line segment, endpoint, midpoint ◦Some aren’t… ◦Congruent ◦bisect ◦Ray Take a few moments to define the easy ones.

7. 1.Name three tennis balls that are collinear. 2.Name three that are coplanar but NOT collinear. 3.Name four that are NOT coplanar. Ball A is in the pocket of the man. Ball C is on the woman’s racquet. All other balls are on the tennis court.

8. Those Not So Obvious Words ◦Congruent ◦Things are congruent if (and only if) they have equal measures. ◦Bisect ◦Divide a segment into two congruent segments. ◦Ray ◦A ray is like a line, but only goes on in one direction (instead of two directions).

9. Notation: How We Write ◦How many points do we need to name to identify a… ◦Point? ◦Line? ◦Plane?

10. Notation ◦Never assume more than what is written!!!

11. What makes a good definition? ◦Concise ◦Includes all necessary information and NOTHING ELSE! ◦What should we include when we make our definitions? ◦The verbal definition ◦Characteristics ◦Examples (Don’t forget pictures!) ◦Non-examples (Don’t forget pictures!)

12. ◦Collinear ◦Coplanar ◦Line Segment ◦Endpoint ◦Congruent Segments ◦Midpoint ◦Bisect ◦Ray ◦Point* ◦Line* ◦Plane*