(a(i))[2]
Determine the internal radius of the hemispherical bowl.
(a(ii))[2]
A geometrically similar spoon has a hemispherical bowl with an internal volume of $50\text{ cm}^3$. Determine the length of its handle.
(b)[3]
A metal kitchen strainer is made from an open hemisphere with radius $5.5\text{ cm}$. $50$ holes are punched through the curved surface. Suppose the metal removed for each hole is a circle of radius $1.5\text{ mm}$. Calculate the external surface area remaining.