We can notice that Can is in the Shape of a Cylinder.
As the Question is how much Coconut Milk is in the Can : It is Related to Volume of the Can, Because Volume of the Can gives how much Coconut Milk it can have.
We know that Volume of a Cylinder is : πr² × Height of the Cylinder
where r is the Radius of the Can
Given the Diameter of the Can as : 8cm
⇒ Radius of the Can = 8/2 = 4cm
⇒ Volume of the Can = π × 4² × 12
⇒ Volume of the Can = 603 cm³ = 0.603 Liter
⇒ Volume of Coconut Milk can have = 0.603 Liter