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Interactive video lesson plan for: How to win a Rubik's cube - Solve this math problem

Activity overview:

Solve this math problem and you will be entered to win a free Rubik's cube every month. A small circle is removed from a larger circle. The area of the small circle is equal to the remaining ring. You must find the width of the ring.

Official contest rules

1. You must send an email to with the correct solution to the problem in this video in order to be eligible for the monthly giveaway.

2. One email if sufficient to be entered into the giveaway every month.

3. As long as this video is publicly uploaded, one Rubik's cube will given away every month to one eligible person.

4. Each winner is not guaranteed to receive a Rubik's cube, and I am not responsible in any way if the prize is not received for any reason. This includes the Rubik's cube getting lost in the mail.

5. All eligible entries must comply with YouTube community guidelines which can be found here

6. Your email address will never be given to any third party and will only be used by Math Meeting. You can always opt out from receiving any email from Math Meeting by replying to any email with "opt out" in the subject line.

7. YouTube is in no way a sponsor of this giveaway and is not liable for anything related to this giveaway.

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4. You review and reflect

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