polygon
One possibility is a closed shape: a circle, ellipse, a closed wriggly shape.
in your blank blank
Edges
Segments of equal length are congruent segments. Shapes can also be congruent if their side lengths and angle measures are equal with each other.
polygon
Fossils are formed in rocks when the hard body parts of an organism get buried in sediment and are preserved when it turns to rock.
if a figure is shifted 3 units to the right, you add to the coordinate
with a screwdriver
open than closed
Planes.
Pyramid, base
craters :]