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.A scalene triangle is an irregular triangle.A right-angled triangle is any triangle with one right angle.An equilateral triangle is a regular triangle and each angle equals 60°.A semi-circle has 2 sides 1 curved side and 1 straight side.

These are names of the 2D shapes children will need to know at elementary school:Īs well as the names, children need to know the properties of 2D shapes as listed below and in the printable table. Learning 2D shapes through Third Space Learning’s online interventions An irregular shape has different lengths of sides and/or interior angles.A regular shape has all sides the same length and all interior angles the same size.A polygon is a 2D shape with straight sides.In elementary school, children will learn about the following 2D shapes: polygons, regular and irregular shapes. The thin plastic shapes that are sometimes used to represent common 2D shapes are actually 3D because they do have depth to them – even if it’s very small. Examples of dimensions include length, width or breadth, depth and height. We normally talk about dimensions as measurements in a direction. What does 2D mean?ĢD in 2D shapes stands for two-dimensional. 2D shapes are flat and cannot be physically held, because they have no depth a 2D shape is completely flat. An example of a 2D shape is a rectangle or a circle. Let’s begin with some definitions! What are 2D shapes?ĢD shapes are shapes with two dimensions, such as width and height. How do 2D shapes relate to other areas of math?.When do children learn about 2D shapes in elementary school?.Which 2D shapes do children learn about?.

Flat shapes for kindergarten