Question

Let vector (a,b,c) be the three vectors such that vector |a| = 3, vector |b| = 4, vector |c| = 5 and each one of them being perpendicular to the sum of the other two, find vector |a + b + c|

Answer 1

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

Now,