The document discusses 2D and 3D shapes. It defines 2D shapes as flat shapes defined by their height and width. Polygons are closed 2D shapes made of straight lines, including triangles, quadrilaterals, pentagons and more. Triangles are 3-sided polygons that can be equilateral, isosceles, scalene, acute, obtuse or right depending on side lengths and angles. Quadrilaterals are 4-sided polygons like squares, rectangles and rhombus. 3D shapes include cubes, cuboids, cones, cylinders and spheres. 3D shapes are related to the 2D shapes that make up their faces or bases.