Write an equation for the surface area of the above cylinder if the length is $L$, the major radius $R$ and minor radius $r$. You must factorise this expression fully.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: Write an equation for the surface area of the above cylinder if the length is $L$, the major radius $R$ and minor radius $r$. You must factorise this expression fully.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: Write an equation for the surface area of the above cylinder if the length is $L$, the major radius $R$ and minor radius $r$. You must factorise this expression fully.