The document defines and describes the key properties of various 2-D shapes including triangles, quadrilaterals, regular polygons, and circles. It outlines characteristics such as the number of sides, angles, lines of symmetry, and rotational symmetry for each shape. The types of triangles covered are equilateral, isosceles, right-angled, and scalene triangles. Quadrilaterals discussed include rectangles, squares, parallelograms, trapezoids, rhombuses, kites, and oblongs. Regular polygons from pentagons to decagons are also defined.