Question

a ladder is 25 cm long reaches a window of building 20 cm above the ground determine the distance of the foot of the ladder from the building​

Answer 1

1. 20cm=height of building(perpendicular)
2. 25cm=height of ladder(Hypotenuse)
3. Distance between ladder and building=Base

so,by pythagorous theorem,

b²=√h²-p²

∴b²=25²-20

⇒625-400

⇒225

∴b=√225

∴b=15

Peace!!!