Which term describes a spiral stairway with a short radius due to a sloped landing?

• A. Short Radius Spiral
• B. Power Source
• C. Battery Backup
• D. Track/Rail Measurement

Answer: (A)

The main idea is how the staircase’s turning path is described by its radius, and how a sloped landing forces that path to tighten. A short radius spiral describes a spiral staircase that has a small turning radius because the landing slope compresses the available horizontal space. The slope limits room for the curve, so the stairs must wind more tightly to fit, resulting in a short radius. This term specifically captures the geometry involved—the tight curvature caused by the sloped landing. The other options don’t describe geometry: one refers to how power is supplied, another to a backup power capability, and the last to measuring a track or rail, none of which address the stair’s curved shape.