Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If O be the origin and if the coordinates of any two points Q 1 and Q 2 be (x 1 , y 1 ) and (x 2 , y 2 ) respectively, then OQ 1 . OQ 2 cos Q 1 OQ 2 =
Text Solution
Verified by ExpertsThe correct answer is:
C
cos ( ∠ Q 1 OQ 2 ) = 
⇒ OQ 1 .OQ 2 cos ( ∠ Q 1 OQ 2 ) = (OQ 1 ) 2 + (OQ 2 ) 2 – (Q 1 Q 2 ) 2
⇒ 
⇒ (x 1 x 2 + y 1 y 2 ).
Or
Let 
= x 1 i + y 2 j
= x 2 i + y 2 j
cos ( ∠ Q 1 OQ 2 ) = 
⇒ OQ 1 .OQ 2 = x 1 x 2 + y 1 y 2 .
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