NEET Class neet Answered
pls explain this answer ..
Asked by surabhilakhara7299 | 21 Jan, 2022, 12:52: AM
Expert Answer
Let us consider the two given vectors 
and 
are sides of parallelogram OPRQ so that diagonal OR is ( + ) as shown in figure .
and are sides of parallelogram OPRQ so that diagonal OR is ( + ) as shown in figure .Let us form another parallelogram OP'R'Q' so that and ( - ) are sides of parallelogram OP'R'Q' .
and ( - ) are sides of parallelogram OP'R'Q' .Hence diagonal OR' represents ( - ) as shown in figure .
- ) as shown in figure .It is to be noted here both the parallelograms are congruent.
If we are given that | + | = | - | , then Bothe diagonals af parallelogram are equal.
+ | = | - | , then Bothe diagonals af parallelogram are equal.In a parallelogram, if diagonals are equal then this parallelogram is Rectangle .
Hence angle between and is 90o
and is 90o
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