![]() ![]() Classify 2D figures in a hierarchy based on properties.Identify line-symmetric figures and draw lines of symmetry.Recognize a line of symmetry for a 2D figure as a line across the figure such that the figure can be folded along the line into matching parts.Recognize right triangles as a category, and identify right triangles.Classify 2D figures based on the presence or absence of angels of a specified size.Classify 2D figures based on the presence or absence of parallel or perpendicular lines.Identify points, lines, line segments, rays, and angles (right, acute and obtuse), and perpendicular and parallel lines in 2D shapes.Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.Understand that shapes in different categories (ex: rhombuses, rectangles, etc) may share attributes (ex: number of sides), and that the shared attributes can define a larger category (ex: quadrilaterals).Draw and recognize shapes having specified attributes (ex: a given number of angles, or a given number of faces).Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.Use shapes to create a composite shape, and compose new shapes from the composite shape.Compose 2D (rectangles, squares, trapezoids, triangles, half-circles and quarter-circles) and 3D shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders).Distinguish between defining attributes (ex: triangles are closed and three-sided) versus non-defining attributes (ex: color, orientation, size). ![]() Model and/or draw shapes in the world, and compose simple shapes to form larger shapes.Compare 2D and 3D shapes to describe how they are the same and different, their parts (corners, sides) and other attributes (having sides that are equal).Recognize the difference between 2D (“flat”) and 3D shapes (“solid”) and name common 2D and 3D shapes, including: 2D shapes (for example, rectangles (including squares), circles and triangles) 3D shapes.Read more: 2D And 3D Shapes: Properties of Shapes When do children learn about 2D shapes in elementary school? Schools following Common Core: A heptagon or septagon is any shape with 7 sides.A parallelogram has two pairs of parallel lines and opposite equal angles.A trapezoid has one pair of parallel lines.A rhombus has two pairs of parallel lines, as well as equal sides and opposite equal angles.A rectangle has two pairs of parallel straight lines and each angle equals 90°.A kite has two pairs of equal-length sides and the diagonals cross at right-angles. ![]()
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