Question

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

100 m

Answer 2

You get it by 40 cos 60 + 80/tan 45 which is 20 + 80 which is 100 :)

Answer 3

Thank you, youre the best!

Answer 4

Welcome heh :D