# C1224 — Derive the Regular rectangle radius from source row changes

## Question

Can the reconstructed source changes account for the Regular2760 input?

## Inputs

```json
{}
```

## Sources

```json
[
  "C1223",
  "C1143",
  "C1157",
  "File22 Actual4114"
]
```

## Opened utc

2026-09-28T05:33:42.643569+00:00

## Results

```json
{
  "regular_provenance": {
    "path": "model/SP_rectangle_regular_provenance.json",
    "sha256": "2f8b03fe5ba73a792a2d88f7055f234c51f0dab12223a1293ccf05731dcd1893",
    "bytes": 343
  },
  "radius": 2760
}
```

## Finding

The Regular input2760 decomposes into the MT baseline radius, post-Flood+650, pre-Flood−350, the declared−215 frame change and the seven-year wrapper. The row grammar explains the two genealogical changes; frame and wrapper remain source premises.

## Reassessment

Generate the Cumulative radius using the cap loss and post-Flood life changes.

## Checks

```json
{
  "native4199": true,
  "opening4206": true,
  "radius2760": true
}
```

## Closed utc

2026-09-28T05:33:42.644030+00:00

## Record provenance

Exact record hash: `3abc7c0960048edb4471a5b3c9cbc5a486f27fee458dae2aa6faa6cfb8b34701`

Source journal: `Research_Cycles/C1132_C1431_Recovered/journal.json`