This isn't really a 'problem', I'm just trying to follow Feynman's reasoning in section 18-2 of Volume 1 The Feynman Lectures on Physics. I've attached a png of the paragraph in question.(adsbygoogle = window.adsbygoogle || []).push({});

I have 2 issues with this:

1. If the length OQ = OP, how can there be a right angle at P(x,y)?

2. I don't understand why QP = r [itex]\Delta\theta[/itex], rather than r * tan ([itex]\Delta\theta[/itex])

Am I missing something? I've checked the latest errata and this isn't mentioned.

Thanks for your help.

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# Homework Help: Feynman Lectures on Physics - Rotation in 2 dimensions

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