In triangle ABC SolutionSolution As per defination of any tr

Solution

Solution:

As per defination of any triangle it consist of three non zero angle and their sum = 180

Now In this we have trinagle ABC

<A + <B + <C = 180

where all angles are non zero

Now it is given that <A = 135

therefore

135 + <B + <C = 180

<B + <C = 45

Now we come to the conclusion that <B must be less than 45 ( otherwise angle <C = 0 , which contradict the defination of triangle )

therefore <B 45 \'

hence proved