Question

A ladder 10 meter long is leaning against a wall. If the top of the ladder is sliding down the wall at 4m/s, how fast is the angle between the top of the ladder and the wall changing when the foot of the ladder is 6 meter away from the wall?

Answer 1

I do not know how to set this up.

Answer 2

This is what the set-up may look like.

Answer 3

yes, i got that.

Answer 4

the wall it 8 ft tall?

Answer 5

but i don't know what to do afterwards

Answer 6

Maybe we have to apply phenomena of related rates here