1. Geometric alphabet

2. Terms to know Parallel lines
Line Segments in a plane that do not meet, do not intercept or touch
always the same distance apart

3. Terms to know
Acute angle
Angle that is less than 90°

4. Terms to know Oblique line
A line segment that is neither perpendicular nor parallel to a given line or surface; slanting; sloping

5. Terms to know Perpendicular line
Line segment that meets another line segment to form a right angle 90°

6. Terms to know Parallel lines
Line Segments in a plane that do meat, do not intercept or touch, always the same distance apart

7. Terms to know
Acute angle
Angle that is less than 90°

8. Terms to know Oblique line
A line segment that is neither perpendicular nor parallel to a given line or surface; slanting; sloping

9. Terms to know Perpendicular line
Line segment that meets another line segment to form a right angle 90°