Bonjour,
exercice 4
13² = 12² + UR²
13² - 12² = UR²
169- 144 = 25
UR² = 25
UR = √25
UR = 5cm
Exercice 5
AB² = 3,8² + 1²
= 14,44+1 = 15,44
AB= √15,44 =>3,93 m
BD = 4m
DF ² = 1² + 4,2²
= 1+ 17,64 = 18,64
DF =√18,64 => 4,32 m
total:
3,93+4+4,32 => 12,25m