anonymous
  • anonymous
Not 100% sure looking for clarity A source of laser light sends rays AB and AC toward two opposite walls of a hall. The light rays strike the walls at points B and C, as shown below:
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
What is the distance between the walls? 80 m 180 m 90 m 100 m
anonymous
  • anonymous
@freckles
anonymous
  • anonymous
@SolomonZelman

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More answers

anonymous
  • anonymous
@Owlcoffee
anonymous
  • anonymous
@Vocaloid !!
Vocaloid
  • Vocaloid
alright, let's split the distance between the wall into two pieces, A and B, ok? we're going to solve for A and B using trigonometry |dw:1435783301582:dw|
Vocaloid
  • Vocaloid
|dw:1435783435188:dw|
anonymous
  • anonymous
I got 90m
anonymous
  • anonymous
?
Vocaloid
  • Vocaloid
as the final answer, or for A?
anonymous
  • anonymous
as for the final answer? what do you think it is? I got 90m
Vocaloid
  • Vocaloid
uh, that's not quite right, can you try solving cos(60) = A/40 for A?
anonymous
  • anonymous
i dont belive its B or D is it A then?
Vocaloid
  • Vocaloid
we'll find the answer in a minute, hold on if cos(60) = A/40, then what is A?
anonymous
  • anonymous
80m?
Vocaloid
  • Vocaloid
not quite... cos(60) = A/40 what happens when you multiply both sides by 40?
anonymous
  • anonymous
180?
Vocaloid
  • Vocaloid
A = 40*cos(60)
Vocaloid
  • Vocaloid
plug that into your calculator and tell me what you get.
anonymous
  • anonymous
60 * 40 = 2400
anonymous
  • anonymous
sorry im bad at this
Vocaloid
  • Vocaloid
cos(60), not 60
Vocaloid
  • Vocaloid
look for the cos() button
anonymous
  • anonymous
i got 100
Vocaloid
  • Vocaloid
use this calculator and type in 40 * cos(60) http://web2.0calc.com/
anonymous
  • anonymous
20
Vocaloid
  • Vocaloid
much better, lets move on to the next part... |dw:1435784134047:dw|
Vocaloid
  • Vocaloid
ok, we can use a different trigonometric ratio, tan(45) = opposite/adjacent = 80/B tan(45) = 1, so 1 = 80/B, so B = 80
anonymous
  • anonymous
Okay so the answer is A than? I think i understand
Vocaloid
  • Vocaloid
no, please hold on...
Vocaloid
  • Vocaloid
|dw:1435784284536:dw| going back to the original diagram, the distance across the wall is A + B A = 20 B = 80 so what is A + B?
anonymous
  • anonymous
100m
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
thank you so much you made my day <3
anonymous
  • anonymous
Actually, you would subtract A (80) and B (20) to get 60 as your true answer. I just took the test and got that right.

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