We have been learning all about 2D shapes in class. We've talked about their geometric attributes(e.g., number of vertices) and have sorted the shapes based on these attributes. We've made pictures using tangrams, some of which are shown above. We will continue to use the vocabulary about 2D shapes throughout the year, however we will wrap up talking about it shortly and will have some assessment pieces. Below are the concepts your child should know about 2D shapes.
-2D shapes are flat and can be seen on many 3D objects. For example, a slice of pizza is a 3D object but it looks like a triangle from the top
-A polygon is closed shape with straight sides and examples of polygons and not polygons
-The following names and number of sides/vertices shapes:
-Triangle(3 sides)
-Square, Rectangle, Rhombus, Trapezoid (4 sides)
-Pentagon (5 sides)
-Hexagon (6 sides)
-Octagon (8 sides)
-Decagon (10 sides)
-The above shapes can be regular shapes (as we expect them to look) or irregular
-A quadrilateral is any polygon with 4 sides (e.g., square, rectangle, trapezoid)
-Shapes can be made from other shapes (e.g., a hexagon can be made from 3 rhombus, or 6 triangles, 2 two trapezoids)
-How to sort shapes by the number of sides/vertices
-Geometric(e.g., number of sides) vs. non-geometric properties (colour, size, texture)
A little extra your child may have learned but is not necessarily required***:
-Shapes: Heptagon(7 sides), and Nonagon (9 sides)
-A parallelogram is a quadrilateral with two sets of parallel sides (e.g, a square)
-A trapezoid is a shape with one set of parallel sides (and they are not all the
standard shape we all "trapezoid")
-A right angle triangle is one with a right angle (a corner like a square)
-An equilateral triangle is a triangle with all equal sides
***This information can be added to answers to show their additional knowledge. For example, when asked to explain everything you know about a square you can say it's a parallelogram as well as a quadrilateral and explain how you know it's a parallelogram.
-A polygon is closed shape with straight sides and examples of polygons and not polygons
-The following names and number of sides/vertices shapes:
-Triangle(3 sides)
-Square, Rectangle, Rhombus, Trapezoid (4 sides)
-Pentagon (5 sides)
-Hexagon (6 sides)
-Octagon (8 sides)
-Decagon (10 sides)
-The above shapes can be regular shapes (as we expect them to look) or irregular
-A quadrilateral is any polygon with 4 sides (e.g., square, rectangle, trapezoid)
-Shapes can be made from other shapes (e.g., a hexagon can be made from 3 rhombus, or 6 triangles, 2 two trapezoids)
-How to sort shapes by the number of sides/vertices
-Geometric(e.g., number of sides) vs. non-geometric properties (colour, size, texture)
A little extra your child may have learned but is not necessarily required***:
-Shapes: Heptagon(7 sides), and Nonagon (9 sides)
-A parallelogram is a quadrilateral with two sets of parallel sides (e.g, a square)
-A trapezoid is a shape with one set of parallel sides (and they are not all the
standard shape we all "trapezoid")
-A right angle triangle is one with a right angle (a corner like a square)
-An equilateral triangle is a triangle with all equal sides
***This information can be added to answers to show their additional knowledge. For example, when asked to explain everything you know about a square you can say it's a parallelogram as well as a quadrilateral and explain how you know it's a parallelogram.