The area of the triangle with vertices $P ( z ) , Q ( i z )$ and $R ( z + i z )$ is (1) 1 (2) $\frac { 1 } { 2 } | z | ^ { 2 }$ (3) $\frac { 1 } { 2 }$ (4) $\frac { 1 } { 2 } | z + i z | ^ { 2 }$
The area of the triangle with vertices $P ( z ) , Q ( i z )$ and $R ( z + i z )$ is\\
(1) 1\\
(2) $\frac { 1 } { 2 } | z | ^ { 2 }$\\
(3) $\frac { 1 } { 2 }$\\
(4) $\frac { 1 } { 2 } | z + i z | ^ { 2 }$