Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. Horizontal rulers compare the selected spans; vertical brackets also identify height on the artwork.
In perspective3.47× timesMeasurements, assumptions & sources
A4 paper is an ISO 216 paper format commonly used internationally for letters, forms and printed documents.
A4 is 210 × 297 mm. Its 0.06237 m² area is calculated from those nominal sides. The marked span uses the exact measurement; the generated paper texture and outline are illustrative.