Find the area of parallelogram formed by and .
Given,
Here, ,
∴
Now the area of parallelogram formed by vectors is,
Let PQRS be a parallelogram formed by vectors shown in figure.
From figure, the area of parallelogram PQRS is,
S = PQ. RN
=
Hence the result.
Let PQR be triangle formed by vectors shown in figure.
From figure, the area of is,