Total surface area of a hemisphere $= \ldots \ldots \ldots . . .$

The volume of a cone with radius $5 \, cm$ and height $12 \, cm$ is ........ $\pi \, cm^{3}$.

The volume of a hemisphere with diameter $1 \, cm$ is $\ldots \ldots \, cm^3$.

$A$ cone is cut by a plane parallel to its base and the smaller cone formed on the upper side of the plane is removed. The remaining part on the other side of the plane is called:

$A$ metallic sphere of radius $21 \,cm$ is melted and recast to form a wire with diameter $0.5 \,cm$. Find the length of the wire in $m$.

$1\,m^3 = \dots \dots \dots cm^3$.