circle
Every point on this shape is the same distance from the center
triangle
Three sides
quadrilateral
Four sides
pentagon
Five sides
hexagon
Six sides
heptagon
Seven sides
octagon
Eight sides
nonagon
Nine sides
decagon
Ten sides
parallelogram
Four sides, with opposite sides being parallel
rectangle
Four sides, with all angles being ninety degrees
square
Four sides, with all angles being ninety degrees and all sides having equal length
polygon
Generic word for any shape with staight sides