Question

At a point A 20m above the level of water in a lake the angle of elevation of a cloud is 30 degree the angle of depression of the reflection of the cloud in the lake. At A is 60 degrees find the distance of the cloud from A

Answer 1

sin 30=1/2=x/y
2 x=y
sin 60=root 3/2=40+x/y
therefore x=40m