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(c) up
(c) down
(b)
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(b) Projection distance
(c) Screen height
(b) Projection distance
(c) Screen height
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inch
m
m
inch
m
inch
cm
inch
cm
inch
m
inch
m
inch
cm
inch
cm
inch
30
30
36
7
3
39
15
33
39
1
0
37
14
40
40
48
9
3
52
21
44
53
1
0
49
19
50
50
61
11
4
65
26
55
66
1
1
61
24
60
61
73
13
5
78
31
66
79
2
1
73
29
70
71
85
15
6
91
36
77
93
2
1
85
34
80
81
97
17
7
105
41
88
106
2
1
97
38
90
91
110
20
8
118
46
100
120
2
1
110
43
100
102
122
22
9
131
51
111
133
3
1
122
48
120
122
147
26
10
157
62
133
160
3
1
146
58
150
153
183
33
13
196
77
166
200
4
2
183
72
200
204
245
44
17
261
103
222
267
5
2
243
96
250
255
306
54
21
327
129
278
334
7
3
304
120
300
306
368
65
26
392
154
334
400
8
3
365
144
