Area of Spherical Caps (light) Wall Art Poster

A disk of positive radius \(r\) in the Euclidean plane has area \(\pi r^2\). The same formula holds for a "disk" on the surface of a sphere if the radius is measured chordally in space! If your first thought is That can't be right, you're far from alone.

An economical lustre poster paper with a high white, satin finish and smooth microporous coating for accurate photo reproduction. The smooth, satin finish and wide colour gamut make this an excellent substrate for posters and professional photographs.