Question

me ajudem por favor nestas

Answer 1

*C=2.π.r

1) a)C=2.π.r=2.π.7=14πcm/ b)C=2.πr=2.π.2,5=5πcm/ c)C=2.π.r=´2.π.1,5=3πcm

*A=π.r^{2}

2) a)A=π.7^{2}=49πcm^{2}/ b)A=π.2,5^{2}=6,25πcm^{2}/ c)A=π.1,5^{2}=2,25πcm^{2}

3)C=2.π.r > 31,40=2π.r > 31,40/2π=r > 15,7π=r