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Recognise 2D and 3D shapes | Year 3 Mathematics PDF Download

How to describe 2D shapes

When describing 2D shapes, we look at various aspects such as their sides, angles, and symmetry.
Let's delve into the characteristics of 2D shapes:

  • Sides: 2D shapes can have sides that are equal in length and some may run parallel to each other.
  • Angles: The angles in 2D shapes can vary. They could be right angles, greater than right angles, or less than right angles, providing diversity in their configurations.
  • Symmetry: 2D shapes may exhibit different types of symmetry. They can possess line symmetry, rotation symmetry, or even both types of symmetries in some cases.

Recognise 2D and 3D shapes | Year 3 Mathematics

How to describe 3D shapes

  • Three-dimensional shapes are characterized by their faces, edges, and vertices.
  • The faces of a 3D shape can be uniform or varied, and a 3D shape may include both curved surfaces and flat faces.

Recognise 2D and 3D shapes | Year 3 Mathematics

Examples

Example 1: Mika draws a shape with 5 equal sides and 5 equal angles. What is her shape?
Sol: 

Recognise 2D and 3D shapes | Year 3 MathematicsA shape with 5 equal sides and 5 equal angles is a pentagon.

Example 2: Dawn describes a 2D shape as having 4 right angles. What shape could it be?
Sol: 
A square has 4 right angles and 4 equal sides.
A rectangle has 4 right angles, but not equal sides.
Dawn’s shape could be a square or a rectangle.
Recognise 2D and 3D shapes | Year 3 Mathematics

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FAQs on Recognise 2D and 3D shapes - Year 3 Mathematics

1. How can 2D shapes be described?
Ans. 2D shapes can be described by their attributes such as the number of sides, angles, and whether they are regular or irregular.
2. How can 3D shapes be described?
Ans. 3D shapes can be described by their faces, edges, and vertices. They can also be classified as polyhedrons or non-polyhedrons.
3. How can one recognize 2D shapes?
Ans. 2D shapes can be recognized by looking at their flat, two-dimensional appearance. They do not have depth or thickness like 3D shapes.
4. How can one recognize 3D shapes?
Ans. 3D shapes can be recognized by their three-dimensional appearance, which includes width, height, and depth. They have volume and can be held in your hand.
5. What are some common examples of 2D shapes?
Ans. Some common examples of 2D shapes include triangles, squares, rectangles, circles, and pentagons.
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