The diameter of this compact disc is 11.8cm. The hole in the middle has a area of 1.54cm2. What is the area of the plastic in this disc?

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23-03-2015
Mathematics

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The diameter of this compact disc is 11.8cm. The hole in the middle has a area of 1.54cm2. What is the area of the plastic in this disc?

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Since3122015 Since3122015 · Answer 1 · 2015-03-23T07:07:55+01:00

Since3122015 Since3122015

23-03-2015

[tex]A=A_{disc}-A_{hole}\\A=\pi r^2-(1.54)\\A=\pi(5.9)^2-1.54\\A=34.81\pi -1.54\\A=109.358840271-1.54\\A=107.818840271[/tex]

Area = 107.82 square inches.

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