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Thanks for any help

 Aug 17, 2020
 #1
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+3

This is not a hard one qwerty

 

first find angle ROP   

When subtended from the same arc, the angle at the centre is twice that at the circumference.

 

Then the distance is just a fraction of a circumference

 Aug 17, 2020
edited by Melody  Aug 17, 2020

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