Problem of the Week: 
Finding the Exterior Angle without Measuring it

Without actually measuring angle AHB (m<ABH) with a protractor, can you determine its measure if you know the measures of angle A and C? If yes, explain below. (See Hint.) 
 

Explain here
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Why does it work?
 
 
 
 
 
 
 
 
 

 

See Hint
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