1. Do Now 3/19/12 Copy HW in your planner. Be ready to copy POTW #7
Text p. 324, #1-23 all, 28, 29
Quiz sections Wednesday
Be ready to copy POTW #7

2. Objective
SWBAT identify parallel, perpendicular, and skew lines, and angles formed by a transversal

3. Section 8.3 “Line and Angle Relationships”

4. Intersecting Lines The point where two lines cross
or intersect (intersection). N R S T M
intersects line at point S

5. Parallel Lines Two lines that are in the same plane
and do not intersect. T N R M
is parallel to

6. Perpendicular Lines
Two lines that intersect and the angles that are formed measure 90°. R N M T
is perpendicular to

7. Skew Lines
lines that do not intersect and they are not parallel. They lie in different planes. N R M T

8. Tell whether the lines appear parallel, perpendicular, or skew.
WX and ZY
WX and UV
WX and XU
WX and UV
are skew.
WX  XU
WX || ZY
The lines are in the same plane and do not intersect.
The lines are in different planes and do not intersect.
The lines appear to intersect to form right angles.

9. Adjacent Angles
Two angles that share a side and vertex but DO NOT overlap 3 4 2 1

10. Vertical Angles
Opposite congruent angles formed by two intersecting lines. 1 2 3 4

11. Identify the adjacent angles and the vertical angles in the diagram below.1 3 2 4
Adjacent angles:
Vertical angles:
1 & 2
1 & 4
1 & 3
2 & 3
2 & 4
3 & 4

12. Transversal
a line that intersects two lines. A T N R M B

13. Angle Relationships Angles that are in matching places
Angles that are inside of the parallel lines
Angles that are outside of the parallel lines

14. Line e line d. Identify the corresponding, alternate interior, and alternate exterior angles.
1 & 5; 2 & 6;
3 & 7; 4 & 8 y e 6 5
Alternate Interior
2 & 7; 4 & 5; 8 7
Alternate Exterior
1 & 8; 3 & 6; 2 1 4 3

15. Line n line p. Find the measure of the missing angles.
Angles 2, 4, and 6 are 130°.
Angles 1, 3, and 5 are 50°.

16. Line x line y. Find the measure of the missing angles.
Angles 2, 5, and 6 are 70°.
Angles 1, 3, 4,and 7 are 110°.

17. NJASK7 Prep
Homework
Text p. 324, #1-23 all, 28, 29