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anonymous
 one year ago
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:
anonymous
 one year ago
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:

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What is the distance between the walls? 80 m 180 m 90 m 100 m

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2alright, 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
 one year ago
Best ResponseYou've already chosen the best response.2dw:1435783435188:dw

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2as the final answer, or for A?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0as for the final answer? what do you think it is? I got 90m

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2uh, that's not quite right, can you try solving cos(60) = A/40 for A?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i dont belive its B or D is it A then?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2we'll find the answer in a minute, hold on if cos(60) = A/40, then what is A?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2not quite... cos(60) = A/40 what happens when you multiply both sides by 40?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2plug that into your calculator and tell me what you get.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0sorry im bad at this

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2look for the cos() button

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2use this calculator and type in 40 * cos(60) http://web2.0calc.com/

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2much better, lets move on to the next part... dw:1435784134047:dw

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2ok, we can use a different trigonometric ratio, tan(45) = opposite/adjacent = 80/B tan(45) = 1, so 1 = 80/B, so B = 80

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay so the answer is A than? I think i understand

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2no, please hold on...

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2dw: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
 one year ago
Best ResponseYou've already chosen the best response.0thank you so much you made my day <3

anonymous
 8 months ago
Best ResponseYou've already chosen the best response.0Actually, 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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