Triangle Law of Vector Addition class 11
If two vectors are represented in magnitude and direction by the two sides of a triangle taken in order, the resultant is represented by the third side of the triangle taken in the opposite order. This is called the triangle law of vectors.
![If two vectors are represented in magnitude and direction by the two sides of a triangle taken in order, the resultant is represented by the third side of the triangle taken in the opposite order. This is called the triangle law of vectors.](https://physicsteacher.in/wp-content/uploads/2021/07/image-40.png)
In the triangle pqr shown in diagram 1 above, the side pq represents vector A, and the side qr represents vector B.
As per, the Triangle Law of Vector Addition, the vector sum of A and B will be represented by the 3rd side of the triangle in the opposite order.
That means pr will represent A + B.
Thus the triangle law of vector summation helps us to get the vector sum.