Question

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:

Answer 1

What is the distance between the walls?

80 m
180 m
90 m
100 m

Answer 2

@freckles

Answer 3

@SolomonZelman

Answer 4

@Owlcoffee

Answer 5

@Vocaloid !!

Answer 6

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

Answer 7

I got 90m

Answer 8

?

Answer 9

as the final answer, or for A?

Answer 10

as for the final answer? what do you think it is?
I got 90m

Answer 11

uh, that's not quite right, can you try solving

cos(60) = A/40 for A?

Answer 12

i dont belive its B or D
is it A then?

Answer 13

we'll find the answer in a minute, hold on

if cos(60) = A/40, then what is A?