Question

Hey, Can you guys help me please? I don't understand 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?

Answer 1

ok, looking at the triangle formed on the bottom left angle, can you tell me the
ANGLE-MEASURES of that triangle ?

Answer 2

if you don;t understand me, always re-ask, don't hesitate!

Answer 3

um, would it be 45 and 90? o: sorry if I sound dumb >.<

Answer 4

yes. 45 and 90. can you find the remaining angle?

Answer 5

I don't know how D:

Answer 6

and yay!

Answer 7

you can or should I?

Answer 8

Can you, please? :) How do you get the third angle?

Answer 9

WAIT

Answer 10

Do you add them both and subtract from 180?

Answer 11

There you go ! Yes!

Answer 12

what is it ?

Answer 13

okay, I got 45.

Answer 14

Good !

Answer 15

yaay! :D

Answer 16

So, now, lets picture this triangle.

Answer 17

do you see why the side which is a question mark is equal to the side that's 30 ?

Answer 18

Because both the angles are the same?

Answer 19

Yes! Because thee angles are congruent.

Answer 20

Okay, so now we know one side is 30, we need th eother one now :D judging by the looks of it, its a 30,60,90 triangle, right?

Answer 21

before going ahead, I for see this, you need to know something.

lets take a triangle that has angle measures of 30, 60, 90.

Answer 22

the proportions always are so if the small side is (for example) 2
then,