1. Unit 1.1 Defining Geometry Vocabulary Number of Instructional Days: 8
Content Standards: Congruence G-CO Experiment with transformations in the plane G-CO.1 Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line.

2. Standards of Mathematical Practice:
Attend to Precision Look for and Make Use of Structure

3. Essential Questions
Why did ancient civilizations pursue Geometry concepts? Why are there undefined notions of Geometry? Who is the most influential mathematician of all time?

4. 1.1.2 Points, Lines, and Planes

5. Line Point A geometric figure with no dimension
Indicates a specific location
Named used ONE capital letter
Example:
A geometric figure with one dimension
Extends without end in two directions
Always straight; no curves
Named using two capital letters (points on the line)
Example:

6. Plane Line Segment “ a piece of a line”
a geometric figure with two dimensions
Extends without end in two directions (diagrams appear to have edges but there are none)
Named using any three points that are on the plane
Example:
Plane GHJ
Plane JIK
Plane IJH
“ a piece of a line”
A geometric figure that has two endpoints and can be measured
Named using the endpoints
Example:

7. Ray
Opposite Rays
A geometric figure that has one endpoint and extends without end in one direction
Named using endpoint listed first and another listed after
Example:
Two rays that have the same endpoint and continue in opposite directions
Example:

8. Examples: Intersection POINT POINT LINE
The intersection of two lines is a The intersection of a line and a plane is a The intersection of two planes is a
Intersection
POINT
The point(s) that two geometric figures have in common
POINT
LINE

9. Examples:
Find the intersection of the given figures:

10. Example: