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# R1, R2, R3 and R4

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The figure below shows the ellipse $$\frac{(x-20)^2}{20}+\frac{(y-16)^2}{16}=2016$$.

Let R1, R2, R3 and R4 denote those areas within the ellipse that are in the first, second, third, and fourth quadrants, respectively. Determine the value of R_1-R_2+R_3-R_4 .

waffles  Nov 20, 2017
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I don't think that's correct

waffles  Nov 21, 2017