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Find angle b.

 

 Aug 4, 2020
 #1
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Angle opposite 57    is   180 - 57 = 123o

 

ENTIRE lower arc from 57  to B is then   2 x 123 = 246o

Arc encompassed by angle next to 'b' is thus   246 - 100 = 146o

    meaning the supplementary angle with b   is     73o  

                      b + 73 = 180       b = 107o

 Aug 4, 2020

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