geometria

$r_1=\frac{C_1}{2π}=\frac{6π}{2π}=3 ~cm$
$S_l1=2πr_1h_1=2*π*3*12=72π ~cm^2$
$S_b1=πr^2=3^2π=9π ~cm^2$
$V_1=πr_1^2h_1=π*3^2*12=108π ~cm^3$

$h_2=(2/5)r_2=(2/5)*8=3,2 ~cm$
$S_l2=2πr_2h_2=2*π*8*3,2=51,2π ~cm^2$
$S_b2=πr_2^2=π*8^2=64π ~cm^2$
$V_2=πr_2^2h_2=π*8^2*3,2=204,8π ~cm^3$

$S_tot=S_l1+S_l2+S_b1+S_b2+(S_b2-S_b1)=72π+51,2π+9π+64π+(64π-9π)=251,2π cm^2$
$V=V_1+V_2=108π+204,8π=312,8~cm^3$

altezza OO'' = 12 cm

raggio  Or'' = 6/2 = 3 cm

raggio O'r' = 8 cm cm^2

altezza OO' = O'r'*2/5 = 3,2 cm

 

Cilindro inferiore 

area totale Aci = 2*π*8^2+2*π*8*3,2 = 16π(8+3,2) =179,2π cm^2

volume Vci = π*8^2*3,2 = 204,8π cm^3 

 

cilindro superiore

area laterale Acls = 2*π*3*12 = 72π cm^2

volume Vcs = π*3^2*12 = 108π cm^3 

 

Solido

area totale A = Aci+Acls = π(179,2+72) = 251,2 cm^2

volume V = π(204,8+108) = 312,8π cm^3