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I need some help with this circle theorem, I understand that the line is over lapped but I can't figure the rest out.

 

http://prntscr.com/m7moxi

 Jan 15, 2019
 #1
avatar+533 
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use isoceles triangles, some of teh sides are the same because they are radii.

 

HOPE THIS HELPED!

 Jan 15, 2019
 #2
avatar+111435 
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The base angles of the bottom triangle are equal because they  are opposite equal radii

 

So....the apex angle of the bottom triangle = 180 - 50 - 50  = 80°

 

And c   is an inscribed angle intercepting the same arc as this central angle of  80°

 

So....c has 1/2 the measure of this angle =  40°

 

 

cool cool cool

 Jan 15, 2019

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