maths --> théorème de pithagote , 4ème

PYTHAGORE?

triangle rectangle ABC rectangle en A,

AB = le mur
BC = l'echelle = 5,50m
AC = la distance mur-pied échelle = 1,40m

on calcule AB

BC² = AB²+AC²
5,50² = AB²+1,40²
AB² = 5,50²-1,40²
       = 28,29
AB  = √28,29 = 5,3cm