Question

if vector a+vector b = vector a -vector b what is the angle ​

Answer 1

Answer:

then the angle must be 180 degree

Explanation:

vector a +vector b =$\sqrt{a^{2} + b^{2} + 2abcostheta }$

since we know cos 180 is -1

so the equation in the root will take the form of (a-b)² under root and square will get cancelled so the answer is 180 degree