Concave is a property of [irregular] polygons. A parallelogram cannot be concave.
Irregular.
"Irregular polygon" seems just fine for me."Irregular polygon" seems just fine for me."Irregular polygon" seems just fine for me."Irregular polygon" seems just fine for me.
irregular
It is irregular
the manner in which a mineral breaks along either curved or irregular surfaces is called a FRACTURE.
the manner in which a mineral breaks along either curved or irregular surfaces is called a FRACTURE.
the manner in which a mineral breaks along either curved or irregular surfaces is called a FRACTURE.
Fracture.
Fracture.
The breaking of a mineral along irregular surfaces is called a fracture. The splitting of a mineral along smooth, flat surfaces is called cleavage.
Irregular surfaces cause the most skate falls.
the manner in which a mineral breaks along either curved or irregular surfaces is called a FRACTURE.
erosion
Fracture
Just area. Since there is no available term for the sum of the areas of all surfaces of a figure, we call that area of the "irregular" figure.
Fracture