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The silver part of the CD is a circular ring with an inner radius of 2cm and an outer radius of 6 cm. What is its area?
Landlord, when I saw this question, you had adopted others, but the answer you adopted was wrong!

You see, this is correct. Method 1: 3. 14 × 6? - 3. 14×2?

=37.68 - 12.56

=25. 12(cm? )

Method 2: 3. 14×( 6? - 2? )

=3. 14×8

=25. 12(cm? )

And my math book also has a question like this (the first volume of grade six), which is exactly the same as my answer! I just watched it again today and told you!

I told you when I saw the adoption, because I didn't want you to know now, but you may already know. It doesn't matter, I just want to help others, not adopt!

Good luck!