3751.25 cm³
Hi there !
Volume (sphere) formula
V(s) = (4/3) × π × r³
we have two hemisheres
V(h) = (4/3) × π × r³ /2
= (2/3) × π × r³
V₁ = 2/3 ₓ π ₓ (12cm)³
= 2/3 ₓ π ₓ 1728cm³
= 1152π cm³
V₂ = 2/3 ₓ π ₓ (4cm)³
= 2/3 ₓ π ₓ 64cm³
= 128π/3 cm³
V = V₁ + V₂
= 1152π cm³ + 128π/3 cm³
= 3617.28 cm³ + 133.97 cm³
= 3751.25 cm³
Good luck !