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[[Image:Complex numbers addition.png|right|thumb|''X'' = ''A'' + ''B'']]
===Addition===
The ''sum'' of two points ''A'' and ''B'' is the point ''X'' = ''A'' + ''B'' such that the [[triangle]]s with vertices 0, ''A'', ''B'' and ''X'', ''B'', ''A'' are [[Congruence (geometry)|congruent]].
[[Image:Complex numbers multiplication.png|right|thumb|''X'' = ''AB'']]
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