8
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a
c2
c1
b
a
c2
c1
b
On a horizontal surface
Suspended from the ceiling
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(
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Screen size
(diagonal)
b
Projection distance
c1
Screen height
c2
Screen height
type(inch)
m
m
inch
m
inch
m
inch
60
25
10
42
70
29
12
49
80
34
13
55
90
38
14
62
100
43
16
69
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