Answers to 2-3 side of WS
1) Def. of midpt.
2) Def. of angle bisct.
3) Mdpt. Thm
4) Ang. Bisc. Thm.
5) Mdpt. Thm.
6) Seg. Add. Post.
7) Ang. Add. Post
8) Ang. Add. Post.
9) Def. of Seg. Bisct.
10) 55
11) 65
12) 80
13) 9
14) 8
15) 4.5
16) 3.5
17) Given, Definitions,
Postulates, Properties,
Theorems
Answers To 2-4 WS
1.
54,144
2.
85, 175
20, 110
61, 151
40.8, 130.8
None, 12
79, 169
(90-2x), (180-2x)
VIE
RIN
RIV or RIE or RIN
48
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13. 90
24. x=29, C=39
14. 40
D= 51
15. 100
25. y=26, E=127
16. 60
F= 53
17. 30
26. y = 35, E=26
18. 50
F= 154
19. 130
20. 120
21. x=44
22. x=23
23. x=24, C=72, D=18
2-5 Perpendicular Lines
**Flashcards due
Tuesday!!**
Perpendicular Lines

Two lines that intersect to form right angles
(90°).
Symbol: ┴

Definition:

–
–
If you have perpendicular lines, then the angles
are 90°.
If you have 90° angles, then the lines are
perpendicular. (converse)
l m
Theorem

If two lines are perpendicular, then they form
congruent adjacent angles
l
Angles 1,2,3,4
are right angles.
1 2
3 4

m
If two lines form congruent adjacent angles,
then they are perpendicular.
Theorem

If the exterior sides of 2 acute, adjacent
angles are perpendicular, then the angles are
complementary.
m
If sides ┴,
then 1 and 2 are complements
p
2
1
n
TOO

Page 57 #6-11
Answers:
6) Definition of Perpendicular Lines
7) Definition of Perpendicular Lines
8) If 2 lines are perpendicular, then they form
congruent adjacent angles
9) Definition of Perpendicular Lines
10) If 2 lines form congruent adjacent angles, then
they are perpendicular
11) Definition of Perpendicular Lines
In closing . . .

How can prove that two lines are perpendicular?
–
–
There is a right angle
They form congruent adjacent angles
Homework


Page 58-60 #1-25 and 28 (6 steps)*see
board for set-up help
Flash Cards
–
Perpendicular