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math

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In triangle ABC, angle B = 3, angle A and angle C = 8 angle A. How many degrees are there in angle B ?

a. 15 degree
b. 30 degree
c. 45 degree
d. 60 degree
e. 120 degree

please answer and explain

  • math -

    the sum of the angles in a triangle is 180 degrees.
    A+3A+8A=180
    12A=180
    A=15

    B=3A=45 deg

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