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NNADVOKAT [17]
3 years ago
10

Have a look of the drawing... What is "d" value? I have tried many methods but don't find how to solve... Pleaseeee

Mathematics
2 answers:
fomenos3 years ago
8 0
Sorry for the bad quality, but this is my answer!

Phoenix [80]3 years ago
3 0
I´d say "d" is the distance from the eye to the wall. 
Now substracting 1.2-1 you´ll get the distance of the wall of the smallest triangle = 0.2 And you do 1.5-0.2= 0.3 that´s the distance of the wall of the other triangle. Then you solve everything with Pitagoras theorem. You have 2 rectangle triangles.
B+alfa=45°
tan^-1(0.2/d)=B
tan^-1(1.3/d)=alfa
THEN:
tan^-1(0.2/d)+tan^-1(1.3/d)=45°
 Now you have 3 ecs and 3 variables.
alfa,B and "d"

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