ze'okru lujvo

x1 is a convex curve/turn/bend in x2, at locus x3, and defined by set of points/properties x4.

Also: x1 is convex. Concave: zorkru. See also: ze'o, kruvi, konvexi.

In notes:

zorkru
x1 is a concave curve/turn/bend in x2, at locus x3, and defined by set of points/properties x4.
konvexi
x1 (set/shape) is convex in sense x2.