Show that the area of the triangle on the argand diagram formed by ... VIDEO
Show that the area of the triangle on the argand diagram formed by the complex number \( z, i z \) and \( z+i z \)
\( \mathrm{P} \) is \( \frac{1}{2}|z|^{2} \).
\[
\text { (1986, } 2 \frac{1}{2} \text { M) }
\]
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