Question

If in a triangle ABC anglebA + angle B = 105° angle B + angle C = 120° then find the value of angle B

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Answer 1

Answer:

B = 55 but the question is wrong

Step-by-step explanation:

a+b = 105

b+c = 120

sum of all interior angles a of a triangle is 180

120 is b+c so here A is missing so

180 - 120 = A

A=50

and in A+B is 105 so

105 - 50 =55

which is angle B

B = 55

Answer 2

Answer:

In triangle ABC

angleA + angleB + angleC = 180°

105°+ angle C = 180°

angle C =180° - 105°

angle C = 75°

angle B + angle C = 120°

angle B + 75° = 120°

angle B = 120° - 75°

angle B = 45°