Question 623697
In triangle ABC, side AC is extended through C to point D to create external angle BCD.
 Angle A measures 47 degrees and external angle BCD mesures 113 degrees.
 What is the measure of angle B?
:
Find angle C: 180 - 113 = 67 degrees
:
Find angle B:
180 - A - C = B
180 - 47 - 67 = 66 degrees