I believe the fewest number of sides in a planar, non-convex polygon is four.
Chat with our AI personalities
Take any two points on or inside a body. If every point on the straight line joining the two points lies within the shape, then it is convex. If not, it is non-convex.
A non convex is a concave and a convex is differently shaped
A scalene triangle has three unequal sides An equilateral triangle has three equal sides
A shape with four non-parallel sides is an irregular quadrilateral. If the quadrilateral is bilaterally symmetrical, it is a deltoid (kite shape).
Any polygon with four or more sides can have a pair of parallel sides. It is also possible to to have non-polygonal shapes - eg a cigar-shape - that has parallel sides.