JEE MATHEMATICS MCQ: 2D GEOMETRY SYSTEM

1 Easy

1 of 1

Application +4 | -1

O

is the origin and the coordinates of

A

and

B

are

\left(x_1, y_1\right)

and

\left(x_2, y_2\right)

respectively then

O A \times O B \cos \angle A O B

is equal to

View answer and explanation

Correct option: B

x_1 x_2+y_1 y_2

Option B (

x_1 x_2+y_1 y_2

) is correct because it represents the dot product of the vectors OA and OB, which is equal to |OA||OB|cos(∠AOB).

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