Réponses

  • Utilisateur Brainly
2013-06-07T13:31:22+02:00

figure 1

aire=π*1,4²-π*0,4²

       =1,8π

       =5,65 cm²

 

figure 2

aire=2*(1*2)+2*(π*1²/2)+4*(1*1/2)

       =4+π+2

       =9,14 cm²

 

figure 3

aire=3*2+2*(3/4*π*1²)

       =6+3/2π

       =7,71 cm²

 

figure 4

aire=3*3/2-1/2*(π*1²)

       =9/2-π/2

       =2,93 cm²