Geo_Book_Answers

LESSON 12.3
1. 329 cm 2
2. 4 cm 2
3. 11,839 cm 2
4. 407 cm 2
5. 35 cm
6. 17 cm
7. 30 cm
8. 56°
9. 45°
10. 66°
11a. approximately 2200 m
11b. approximately 1600 m
11c. approximately 1400 m
12. The other two walls were 300 ft and
approximately 413 ft. The area was approximately
45,000 ft 2 .
13. approximately 48 m
14. 2366 cm; approximately 41°
15. approximately 5°
16. 93
8
cm3 , or approximately 6 cm3 17. Because AB CD , A D by the AIA
Conjecture. Because D and B intercept the
same arc, D B. Therefore A B by the
transitive property. So ABE is isosceles by the
Converse of the Isosceles Triangle Conjecture.
18. Draw line through the two points. Then fold
the paper so that the two points coincide. Draw
another line along the fold. These two lines contain
the diagonals of the square. Now fold the paper so
that the two lines coincide. Mark the vertices on
the other line.
19. AC 60 cm, AE 93.75 cm, AF 117 cm
20. Box 1; about 1.2 in. longer
ANSWERS TO EXERCISES 137
Answers to Exercises