aria discului se afla dupa formula πRla puterea a 2
a) π*10^2=100 π cm^2
b) π*3/4^2=π * 3/4*3/4=9/16π cm^2
c) π*2,(3)^2=π*2,(3)*2,(3)sau π*2intregi si 3/9 * 2intregi si 3/9=21/9*21/9=441/9=49cm^2
d) π*2/π^2= π*2/π*2/π= π*4/π^2=4π/π^2=4/π cm^2
sper ca ai nteles ca ( ^) inseamna la putere
