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1. Homework Statement
Finding the area of a disc by integration of rings.
2. Homework Equations
A ring of radius r and thickness dr has an area of [tex]2 \pi rdr[/tex].
3. The Attempt at a Solution
Why isn't it [tex] \pi (2rdr + (dr)^2)[/tex]?
Finding the area of a disc by integration of rings.
2. Homework Equations
A ring of radius r and thickness dr has an area of [tex]2 \pi rdr[/tex].
3. The Attempt at a Solution
Why isn't it [tex] \pi (2rdr + (dr)^2)[/tex]?