Question

In a right angled triangle the three vectors a,b

  and c add to zero. Then a.b

  is

Answer 1

Answer:

ANSWER

From polygon law, three vectors having summation zero should form, a closed polygon(triangle). Since, the two vectors are having same magnitude and the third vector is  

2

​  

 times that of either of two having equal magnitude, i.e., the triangle should be right angled triangle.

Angle between A and B, α=90  

o

 

Angle between B and C, β=135  

o

 

Angle between A and C, γ=135  

o

.

Explanation:

Answer 2

äñ$wër î$ 0………….…….........