Radius and arc from span and rise

Code-Snippets

curl "https://api.oanor.com/arch-api/v1/from-span-rise" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/arch-api/v1/from-span-rise", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/arch-api/v1/from-span-rise");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/arch-api/v1/from-span-rise",
    headers={"x-oanor-key": "oanor_test_..."}
)

Beispiel-Response

Echte Antwort dieses Endpoints, erfasst beim letzten Health-Check.

{
    "data": {
        "note": "A segmental arch is an arc of a circle through the two springings and the crown. The radius = (span²/4 + rise²) ÷ (2·rise) — flatter arches (small rise) have huge radii. The central angle subtends the span, the arc length is the curve a mason or joiner works to, and the segment area is the void below the arc. A rise of exactly half the span is a semicircle; beyond that it is more than a semicircle and a different set-out.",
        "inputs": {
            "rise_m": 0.5,
            "span_m": 2
        },
        "radius_m": 1.25,
        "arc_length_m": 2.3182,
        "segment_area_m2": 0.6989,
        "central_angle_deg": 106.2602
    },
    "meta": {
        "timestamp": "2026-06-07T08:17:55.012Z",
        "request_id": "785dbfb8-88af-4ee0-a5ae-b6a80486b6fc"
    },
    "status": "ok",
    "message": "From span and rise",
    "success": true
}