Question

prove that the sum of angles of triangle is180if in triangle ABC angle A+ angle B =120 and angle B + angle C=100 find angle B​

Answer 1

Answer:

40

Step-by-step explanation:

If angle A + angle B = 120 degrees

then angle C = 180 - 100 = 80 degrees.

If angle B + angle C = 100 degrees

then angle A = 180 - 120 = 60 degrees.

Then angle B = 180 - (60 + 80)

                       = 40