
dargestellt
presented
Shown, depicted, or described in a certain way. Refers to the visual or textual presentation of information or objects.
Die im Diagramm dargestellten Ergebnisse sind eindeutig.
The results presented in the diagram are clear.
presented / portrayed
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presented
Shown, depicted, or described in a certain way. Refers to the visual or textual presentation of information or objects.
Die im Diagramm dargestellten Ergebnisse sind eindeutig.
The results presented in the diagram are clear.

portrayed
Playing or embodying a role in a play, film, or another performance.
Die von der Schauspielerin dargestellte Königin war sehr überzeugend.
The queen portrayed by the actress was very convincing.
'Dargestellt' (presented/portrayed) is the past participle of the separable verb 'darstellen' (to present/portray). The verb is made up of the prefix 'dar-' (an old form of 'da') and 'stellen' (to put/place) and literally means to put something up for viewing.
Der Film stellt die Ereignisse sehr dramatisch dar.
The film presents the events very dramatically.
As a past participle, 'dargestellt' (presented/portrayed) can be used as an adjective before a noun, in the perfect tense with 'haben' (to have), or in the passive with 'werden' (to become/be). These three uses are very common.
Die dargestellte Grafik zeigt die Verkaufszahlen.
The presented graphic shows the sales figures.
You can recognize this meaning from the context of information, data, or facts. Typical nouns are 'Ergebnisse' (results), 'Prozesse' (processes), 'Zahlen' (numbers), or 'Fakten' (facts), often in connection with graphics or reports.
Die im Bericht dargestellten Fakten sind alarmierend.
The facts presented in the report are alarming.
You can recognize this meaning from the context of art and acting. When it is about a 'Rolle' (role), a 'Figur' (character), a 'Charakter' (character), or a 'Schauspieler' (actor), it means embodying a person.
Die von ihm dargestellte Figur war der Bösewicht der Geschichte.
The character portrayed by him was the villain of the story.
written on
Both words can refer to text or signs on a surface. „Beschrieben“ says that something has actually been written there, while „dargestellt“ emphasizes the presentation of information or an object. Use „beschrieben“ for writing that is present and „dargestellt“ for information or a form that is shown.

Die Route ist auf dem Plakat als rote Linie dargestellt.
The route is shown on the poster as a red line.
Die Vorderseite des Plakats ist mit wichtigen Hinweisen beschrieben.
The front of the poster has important notes written on it.