SVP exercice 36 ! Merci d'avance !

a) 5V12-V75 =
   10V3-5V3 = 5V3

b) carré ; AB =5V3, DC = 5V3

c) 4(5V3) = 20V3

d) (5V3)² = 75cm²

a /
5V12-V75 = 5V4x3 -V25x3 = 5V2²x3 -V5²x3 = 10V3-5V3 = 5V3

b/ abcd est un carre

dc =ab = 5V12-V75 = 5V3
bc =ad = 5V3

c/
perimetre abcd =  4xcote
donc
4x5V3
20V3

20V3 = 34.64106
donc au millimetre 34.641

d/
aire d 'un carre =  cote²
(5V3)² = 5² x (V3)² = 25 x3 = 75 cm²