Whiteboard / Original editorial explainer
An original English educational whiteboard video explaining a circle, an irregular outline and a radius, with narration, progressive drawing and subtitles.
Input record
A circle is a round outline with no corners. Every point on that outline is the same distance from the center.
An uneven outline is different. Some parts bend farther outward and others curve inward, so it is not a perfect circle.
The straight segment from the center to the edge is called the radius. It connects the center to one point on the circle.
Follow the outline back to where you started. A circle is closed, round, and has no corners.Provenance
Both complete MP4 streams were decoded without errors. Dimensions, duration, audio levels, captions, sampled frames from every scene, byte size and SHA-256 were checked. First-party curated evidence, not an independent review.
Initial radius/diameter narration produced an incorrect radio-receiver illustration. The first export was rejected. The script was simplified to circle, irregular outline and radius; resources were explicitly selected and the scenes regenerated. Subtitle size was increased for readability. The published MP4 is the original Donatello export, with no creative post-processing.
A short, manually reviewed credit-funded example, not an unattended quality benchmark or a test of Relax eligibility, waiting times or 20-minute duration. Drawings can use reusable resources. Narration is synthetic; subtitle timing is approximate. Results vary and other topics may need corrections.
5ae9469d7ac1fdfaf5fcb7e1f0bf3325dc435a3b81b5212421cf77d5edbb83671,137,119 bytes · video/mp4Rights and reuse
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