Solution:
Let angle between and be then A2 + B2 + 2ABcos = /2
122 + 52 + 2(12)(5)cos = 132
cos = 0=
OR
132 =122 + 52 i.e.,C2 = A2 + B2
So,
If the magnitudes of vectors and 12,5 and 13 units respectively and , the angle between vectors is:
Let angle between and be then A2 + B2 + 2ABcos = /2
122 + 52 + 2(12)(5)cos = 132
cos = 0=
OR
132 =122 + 52 i.e.,C2 = A2 + B2
So,