I think Mr. Gishe went trigger happy when he was assigning homework today.(adsbygoogle = window.adsbygoogle || []).push({});

[tex] y=\sqrt{a^2-x^2} [/tex] where -a<=x<=a is a semicircle with r=a

show why [tex]\int_{-a}^{a} \sqrt{a^2-x^2}\,dx = \frac{1}{2} \pi a^2 [/tex]

(I think that's how its written)

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# One last problem

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