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Find the area of the shaded region.

Find the area of the shaded region.-example-1

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Answer:

10pix+65pi

Explanation:

pi(x+9)^2-pi(x+4)^2

=pi(x^2+18x+81)-pi(x^2+8x+16)

=pix^2+18pix+81pi-pi(x^2+8x+16)

=pix^2+18pix+81pi-pix^2-8pix-16pi

=10pix+65pi

User Mark Pauley
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