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# FP1 question: Watch

1. Can someone explain to me how for part b the answer is N = 8?

Thank you!

Jack
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2. (Original post by iMacJack)
Can someone explain to me how for part b the answer is N = 8?

Thank you!

Jack
Think about what the angle of rotation A represents and think about how many multiples of that rotation you need to get to a multiple of 360 degrees, which will be the identity matrix.

Remember that if A represents a rotation of then is a rotation of followed by a rotation of for a total rotation of .
3. (Original post by Zacken)
Think about what the angle of rotation A represents and think about how many multiples of that rotation you need to get to a multiple of 360 degrees, which will be the identity matrix.

Remember that if A represents a rotation of then is a rotation of followed by a rotation of for a total rotation of .
Ahhhh okay right I'm with you - many thanks!!

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4. (Original post by iMacJack)
Ahhhh okay right I'm with you - many thanks!!
Cheers.

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