Hemisphere

The outer radius of a hollow hemisphere is $15 \mathrm{cm}$ and its inner radius is $11 \mathrm{cm}$. Find the total surface area of the hollow hemisphere in square centimetres.

Write your answer up to two decimals and consider $\mathrm{\pi }=\frac{22}{7}$.

The outer radius of a hollow hemisphere is $16 \mathrm{cm}$ and its inner radius is $12 \mathrm{cm}$. Find the total surface area of the hollow hemisphere in square centimetres.

Write your answer up to two decimals and consider $\mathrm{\pi }=\frac{22}{7}$.

The outer radius of a hollow hemisphere is $10 \mathrm{cm}$ and its inner radius is $8 \mathrm{cm}$. Find the total surface area of the hollow hemisphere in square centimetres.

Write your answer up to two decimals and consider $\mathrm{\pi }=\frac{22}{7}$.

The outer radius of a hollow hemisphere is $22 \mathrm{cm}$ and its inner radius is $18 \mathrm{cm}$. Find the total surface area of the hollow hemisphere in square centimetres.

Write your answer up to two decimals and consider $\mathrm{\pi }=\frac{22}{7}$.

The outer radius of a hollow hemisphere is $20 \mathrm{cm}$ and its inner radius is $16 \mathrm{cm}$. Find the total surface area of the hollow hemisphere in square centimetres.

Write your answer up to two decimals and consider $\mathrm{\pi }=\frac{22}{7}$.

The outer radius of a hollow hemisphere is double the inner radius then the curved surface area is 

The outer radius of a hollow hemisphere is double the inner radius and the curved surface area is $396 {\mathrm{cm}}^2$. Find the outer radius and inner radius of the hollow hemisphere.

The outer radius of a hollow hemisphere is $14 \mathrm{cm}$ and the curved surface area of the hollow hemisphere is $924 {\mathrm{cm}}^2$. Find the inner radius of the hollow hemisphere.

The outer radius of a hollow hemisphere is $28 \mathrm{cm}$ and its inner radius is $14 \mathrm{cm}$. Find the curved surface area of the hollow hemisphere.