Question

A fireman's ladder ,100 m long reaches a point on the highrise building that is 80m above the ground . if the ground is horizontal, how many metres from the building is the foot of the ladder ​

Answer 1

u can simply use Pythagoras theorem to take out the lenth between foot of ladder to building.

here

(length of ladder)^2-(length of building)^2=(length of foot of ladder from building.)^2

(100)^2-(80)^2=(10000-6400)

so length ={10000-6400)^2=60