Gabriel's horn has an infinite amount of this quantity.
The Mollweide [MALL-vy-duh] map projection preserves this quantity, which is given for solids of revolution by Pappus's first theorem. Gabriel's horn has an infinite amount of this quantity. It can be found (*) "under a curve" via integration, and for triangles using the semiperimeter in Hero's formula. For a circle, pi r squared gives, for 10 points, what quantity that for a rectangle is expressed as width times length?
The Mollweide [MALL-vy-duh] map projection preserves this quantity, which is given for solids of revolution by Pappus's first theorem.
area (accept signed area or surface area)