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Area Using Horizontal Slices
If the rightmost and leftmost boundaries are:
$$x=f(y),\quad x=g(y)$$
then the area between $$y=c$$ and $$y=d$$ is:
$$A=\int_c^d|f(y)-g(y)|\,dy$$
Usage
- Used when expressing the curves as functions of $$y$$ makes the area calculation easier.
