exercice maths 3e svp piece jointe mise urgent merci

HC = 100 - 30 = 70  ; AC = 80

SH/AC = KH/KC => SH = 80.30/100 = 24

KA = V(10000-6400) = 36
KS/KA = KH/KC => KS = 36.30/100 = 10,8
SA = 36 - 10,8 = 25,2
il faut 199,2 m  il aura assez sde clôture.