a polygon is convex
A non convex is a concave and a convex is differently shaped
projector have concave or convex
the union of two convex sets need not be a convex set.
convex
Contour lines that are close together indicate steep terrain, such as hills or mountains. When contour lines form closed loops with smaller lines inside, this indicates a depression or valley. The direction the contour lines bend can also show the shape of the land, with convex lines indicating hills and concave lines indicating valleys.
A convex polygon.I suspect that what you mean is a convex polygon.
convex
yes a triangle is a convex
"Convex" is an adjective.
convex
A trapezoid is convex.