math.geometry.circle

• Golden tests 3 / 3
• Boundary tests 2 / 2
• Property tests 5 / 5
• Production surface contract 3 / 3
}
• Engine tested Yes
• Source checked Yes
• Artifact integrity PASS
• Production attestation Embedded snapshot: STALE · Last attested schema matched 1.1.0 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · Live production status STALE (3 capabilities; 161 remain CURRENT) @ 2026-09-20T23:37:12.315Z
• Semantic contract PASS
• Evidence attested at 2026-09-18T21:41:55.460Z
• Last production check 2026-09-18T21:41:55.460Z
• Public / cache PASS
• Origin PASS
• Supplemental domain review Not performed
• Named expert review Not performed

• release artifacts aligned PASS
• schema valid input executes PASS
• engine success output validates schema PASS

Fingerprint sha256:ad2f4a5081a1fbd37d325d94ea5c16caea6b5c65d7d6ef9bb16dc92729af2421

Input schema sha256:36260ff28aacf5c87aca06fee28339bd8423f42d3ffff1f1769c14a0ae0fd402 · Output schema sha256:7e30f47eb3874a791f11ab46ef9f6eede0abd772066751a9e7f80cc0a01e5164 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Tool

circle

Engine

circle

Engine build

2026-09-20

Evidence core

2026-09-20T14:12:52.167Z

Rendered

2026-09-20T23:43:47.435Z

Last reviewed

—

Assumptions

• Euclidean plane
• Not spherical geometry
• Not Pythagorean-only

Limitations

• Not a²+b²=c² — use /calc/math/pythagorean
• r ≤ 0 → VALUE_MUST_BE_POSITIVE
• Spherical geometry is out of scope