there all polygons
They are all polygons having their own particular properties
squares, right triangles, rectangles
Circles don't, but the others do, if you think of squares and rectangles as parallelograms.
squares, rectangles, triangles, polygons...
they are alike because they are a four sided shape and they have the same number of sides.
Triangular prisms have triangles and rectangles. A rectangular prism has squares and rectangles.
9 (six rectangles = three squares)
2D shapes include squares, triangles, rectangles and circles.
Circles, squares, rectangles, and triangles are solids that have a flat surface.
Sometimes stars, triangles, rectangles, rhombuses or squares.