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Thanks!

 Oct 13, 2019
 #1
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+1

The angles in each of those 3 similar tirangles are   66,60 and 54  

 

The 3 triangles are similar so their angles are 66,60 and 54

angle MNO must be 54 so that MNO can be 60

which means that angle NRO must be 60 degrees

 

 

It would be better to do  formal solution though.

 

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NOTE: I am editing because it mostly disappeared when I published. How annoying.

I have not seen that compilation error for a long time.

 Oct 13, 2019
edited by Melody  Oct 13, 2019

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