Answers for Lesson 1-9, pp. 65-68 Exercises

1.	22 in.	2.	36 cm	3.	56 in.	4.	78 cm	
5.	120 m	6.	48 in.	7.	38 ft	8.	15cm	
9.	10ft	10.	3.7in.	11.	 m	12.	56.5 in.	
13.	22.9 m	14.	1.6 yd	15.	351.9 cm			

16. 		17. 
18. 	19. 

20.	 ft2  or 192 in.2	21.	4320 in.2  or yd2	
22.	 ft2  or 162 in.2	23.	8000 cm2  or 0.8 m2	
24.	5.7 m2  or 57,000 cm2	25.	120,000 cm2  or 12 m2	
26.	6000 ft2  or yd2	27.	400m2	
28.	64ft2     29.  in.2	30.	0.25,m2  31. 9.9225ft2	

Answers for Lesson 1-9, pp. 65-68 Exercises (cont.)

32.	0.01m2	33.	153.9 ft2	34.	54.1 m2		35.	452.4 cm2	
36.	452.4 in.2	37.	310 m2	38.	80 in.2				
39.	a. 144 in.2			b.	1 ft2						
	c.   144; a square whose sides are 12 in. long and a square whose sides are 1 ft long are the same size.	
40.	a.  30 squares		b.	16; 9; 4; 1					
	c.   They are =. Post. 1-10						
41.	3289 m2										
42-45. Answers may vary. Samples are given.			
42.	38 in.; 90 in.2				43.	39 in.; 93.5 in.2	
44.	12 ft; 8 ft2					45.	8 ft; 3.75 ft2		
46.	Answers may vary. Sample: For Exercise 44, you use feet
because the bulletin board is too big inches.	
47.	16 cm			48.	96 cm2		49.	288 cm	
50.	a. Yes; every square is a rectangle.				
	b. Answers may vary. Sample: No, not all rectangles are squares.	
c.   A =or A =
51.  a.
b. 208 in.2, 208 in.2

Answers for Lesson 1-9, pp. 65-68 Exercises (cont.)

52.  512 tiles

53. 

54.

55.38 units	56. 54 units
57.1,620,000 m	58. D

59.	Area; the wall is a surface.
60.	Perimeter; weatherstripping must fit the edges of the door.
61.	Perimeter; the fence must fit the perimeter of the garden.
62.	Area; the floor is a surface.   63. 6.25units

64.	a.	base		height		area	
		1		98		98	
		2		96		192	
		3		94		282	
				•			
				•			
				•			
		24		52		1248	
		25		50		1250	
		26		48		1248	
				•			
				•			
				•			
		47		6		282	
		48		4		192	
		49		2		98	
	c.	25 ft by 50 ft			

Answers for Lesson 1-9, pp. 65-68 Exercises (cont.)

65.	a. 9	b.	9		c. 9	d.	9	
66.	 units2			67.	 units2			
68.	(9m2 — 24mn + 16n2) units				
69.	Answers may vary. Sample: one 8 in.-by-8 in. square + one 5 in.-by-5 in. square + two 4 in.-by-4 in. squares		
70.	388.5 yd