Question

angle A+angleB=120degree and angle B+ angleC=135degree find a angle B
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Answer 1

Step-by-step explanation:

Hi ,

In a triangle sum of the three angles

is equal to 180°.

In triangle ABC ,

A + B + C = 180° -----( 1 )

A + B = 105

A = 105 - B ----( 2 )

B + C = 120°

C = 120 - B -----( 3 )

Put ( 2 ) and ( 3 ) in equation ( 1 ) ,

105 - B + B + 120 - B = 180

225 - B = 180

- B = 180 - 225

-B = -45

Therefore ,

B = 45°

I hope this helps you.

:)Mrk me as BRAINLIEST

Answer 2

Answer:

75

Step-by-step explanation:

Angle A + Angle B = 120

Angle B + Angle C = 135

Adding both :-

(Angle A + Angle B + Angle C) + Angle B = 255

180 + Angle B = 255

Angle B = 75