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Fotothek df tg Geometrie Planimetrie Proportion Viereck Flche. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Seite Frankfurt Main proportionale Vergrerung der Flche eines Rechtecks Papier Holzschnitt cm Geometrie Planimetrie Proportion Viereck Flche ppn Druck Deutsche Fotothek gefrdert von der Deutschen