Question

A 20 ft ladder reaches a window 18 ft high. How far is the foot of the ladder from the base of the building?

Answer 1

Pythagoran theorem

length of ladder=hyptonuse
height of window is one leg
distance base is fram building is other leg
a²+b²=c²
c=hyp
a and b are legs

18²+b²=20²
324+b²=400
b²=76
b=2√19ft or aprox8.7178ft