![]() 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.A square is a regular quadrilateral and each angle equals 90°.An isosceles triangle has two sides and two angles that are the same. ![]()
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