Geo_Book_Answers

Answers to Exercises
1–3. possible answers:
1.
D
2.
3.
4.
5.
6.
7.
8.
45
O G
R
B
A
D
T E
M
A
C
40
I G
A
P E
R
B
B
50
140
C
LESSON 1.3
9. B is a Zoid. A Zoid is a creature that has in its
interior a small triangle with a large black dot
taking up most of its center.
10. A good definition places an object in a class
and also differentiates it from other objects in that
class. A good definition has no counterexamples.
12 ANSWERS TO EXERCISES
E
G
S
D
D
E
40
11. The measures of complementary angles sum
to 90°, whereas the measures of supplementary
angles sum to 180°.
12. No, supplementary angles can be unconnected,
while a linear pair must share a vertex and
a common side.
13a. an angle; measures less than 90°
13b. angles; have measures that add to 90°
13c. a point; divides a segment into two congruent
segments
13d. a geometry tool; is used to measure the sizes
of angles in degrees
14.
If AB and CD intersect at point P so that P is
between A and B, and P is between C and D, then
APC and BPD are a pair of vertical angles.
15. true
16. true
17. true
18. false
19. false
A
B
P
C
D