If a=3,b=4,c=5 and a+b+c=0 then angle between a and b is

Dear pallavi

|a|=3,|b|=4,|c|=5

 a+b+c=0

 a+b =-c

|a+b| =|-c|

|a+b|² =|-c|²

|a|² +|b|² +2a.b =|c|²

 9  + 16  +2a.b= 25

a.b=0

 so a and b are perpendicular

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