LIT On a sphere of radius R, a cap of height R has area 2πR², half of 4πR². This page recomputes both areas.
AMBER The spherical cap area 2πRh is the standard formula. Here the height is the radius, so the cap is a hemisphere.
MODEL The cut is the equator. The upper cap is half the ball.
EXPLAINER proposes the next sentence of the cap. The scribe keeps a sentence only when the number in it matches the area just recomputed. The page throws if EXPLAINER does not improve.
Checking the sphere.
Seal sha256(name|slug|blurb): 36e1211fcbd58b517a8b6bea568b52e71a275e9e61bff081191eff0eea3c53f5