jganu -jga- gismu

x1 is an angle [2-dimensional shape/form] from vertex x2 subtended by lateral [segment] x3.

Also (adjective:) x1 is angular; x2 corner; (segment x3 can be defined by interval). See also kojna, linji, konju, mokca.


In notes:

cidni
x1 is a/the knee/elbow/knuckle [hinged joint, body-part] of limb x2 of body x3.
kojna
x1 is a corner/point/at-least-3-dimensional [solid] angle [shape/form] in/on x2, of material x3.
konju
x1 is a cone [shape/form] of material x2 with vertex x3.
linji
x1 is a line/among lines [1-dimensional shape/form] defined by set of points x2.
mokca
x1 is a point/instant/moment [0-dimensional shape/form] in/on/at time/place x2.
radno
x1 is x2 radian(s) [metric unit] in angular measure (default is 1) by standard x3.
cibjgacmaci
c1 is trigonometry of triangle j1.