In $$\(\triangle A B C \quad m \angle A+m \angle C=m \angle B\)$$. What is the degree measure of $$\(\angle B\)$$ ?
A.
80
B.
90
C.
100
D.
180
Exam No：2018 First Round Grade 4 Year：2018 Question No：9
Answer:
B
Knowledge points:
G4 - Geometry - Shape Properties
Solution:
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