Question

ajutor urgent vă rog​

Answer 1

Eu stiu ca: Aria cercului= π * r² (unde "π" este pi, egal cu aprox. 3,14).

a)r=9cm -> A= π * 9² = 3,14 * 81= 254,34cm²

b)r=13cm -> A= π * 13² = 3,14 * 169 = 530,66cm²

c)r=2,7cm -> A= π* 2,7² = 3,14 * 7,29 = 22,8906cm²

d)r=0,14cm -> A= π * 0,14²= 3,14 * 0,0196 = 0,061544cm²

   Succes!