Can someone explain how to do this
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.

What is the distance between the walls?

Question

Can someone explain how to do this 
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.
 
What is the distance between the walls?

anonymous · Answer

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anonymous · Answer

the triangle on the left side of the laser source is a 30-60-90 triangle.
the triangle on the right side of the laser source is a 45-45-90 triangle.

do you know the side relationships in these triangles?

anonymous · Answer

What do you mean by relationship? are you talking cos sin and tan?

anonymous · Answer

you don't need trigonometry here... just basic geometry...

anonymous · Answer

would you put it into a ratio. I just took a review test and got this problem wrong so I am not exactly sure how to do it.

anonymous · Answer

in any 30-60-90 triangle, the side adjacent to the 60 degree angle is half the length of the hypotenuse.

in any 45-45-90 triangle, two sides are equal...

anonymous · Answer

Okay I think I understand now Thank you.

anonymous · Answer

yw...
you got the distance between the walls then?

anonymous · Answer

you should get to know (and recognize) these special triangles... they come up often in trigonometry.