What are 2D shapes?
Shapes are shapes with two dimensions “width and height”. 2D shapes are flat and cannot be physically held, because they have no depth.
What is Polygon?
Polygon is 2dimensional shapes. It is a flat shape with straight sides, and its shape is “closed” (all the lines connect up). A regular shape has all sides the same length and all interior angles the same size. An irregular shape has different length sides and/or interior angles.
Here are some examples of 2D shapes:
Triangle – Square – Kite – Rectangle – Trapezium – Parallelogram – Pentagon – Hexagon – Octagon – Decagon – Nonagon – Rhombus
Circle, oval, and Ellipse are 2D shapes, but are not polygons because they have curves.
What are Regular and Irregular 2D Shapes?
A 2D shape can be classified as regular or irregular based on the length and the interior angles:
A 2D Regular Shapes:
All sides in 2D shapes are equal in length and all its interior angles measure the same.
A 2D Irregular Shapes:
All sides in 2D shapes are unequal length and all its angles are of unequal measures.
Let’s learn shapes and its properties:
Shape 
Properties 
Sides 
Circle 
A circle has 1 curved side

1 
Oval 
An oval has no straight sides and no corners, and has 1 face.

– 
Ellipse 
An ellipse is a circle that has been stretched in one direction, to give it the shape of an oval. But not every oval is an ellipse.
Ellipse has two focal points. 
– 
Triangle 
A triangle is a closed shape with 3 sides, 3 vertices and 3 angles.
It can have up to 2 axes of
symmetry.Example of Triangle: Pyramids and slice of pizza.

3 
Square 
A square is a regular quadrilateral and each angle equals 90°.
“ all each sides are equal “

4 
Kite 
A kite has two pairs of equallength sides and the diagonals cross at rightangles. 
4 
Rectangle 
A rectangle has two pairs of parallel straight lines and each angle equals 90°.It has two axes of symmetry.

4 
Rhombus 
A rhombus has two pairs of parallel lines, as well as equal sides and opposite equal angles.It has 2 lines of symmetry. 
4 
Trapezium 
A trapezium has one pair of parallel lines, and pairs of equal angles. It can have a line of

4 
Parallelogram 
A parallelogram has two pairs of parallel lines and opposite equal angles.Usually has no axes of symmetry. 
4 
Pentagon 
A pentagon has interior and exterior angles. It can be either regular or irregular.

5 
Hexagon 
A hexagon has six sides, six vertices and six angles. It can have up to 6 axes of symmetry. Hexagon has interior and exterior angles.

6 
Heptagon or (Septagon) 
A heptagon has interior and exterior angles.

7 
Octagon 
An octagon has interior and exterior angles.It can have up to 8 axes of symmetry

8 
Nonagon 
A nonagon has interior and exterior angles.

9 
Decagon 
A decagon has interior and exterior angles. 
10 
Let’s draw the 2D shapes:
Circle 

Oval 

Triangle 

Square 

Rhombus 

Trapezium 

Parallelogram 

Pentagon 

Hexagon 

Heptagon (or Septagon) 

Octagon 

Decagon 
3D Shapes
What are the 3D shapes?
3D shapes are shapes with three dimensions, width, height and depth. 3D shapes can be physically held.
Properties of 3D shapes
3D shapes have faces (sides), edges and vertices (corners).
Faces
A face is a flat or curved surface on a 3D shape.
Edges
An edge is where two faces meet.
Vertices
A vertex is a corner where edges meet. The plural is vertices.
These are types of 3D shapes:
Sphere – Hemisphere – Cone – Tetrahedron or Triangular based pyramid – Cylinder – Triangular prism – Hexagonal prism – Pentagonal prism – Cube – Cuboid.
Shapes 
Properties 
Face 
Edges 
Vertices 
Sphere 
A sphere is round in shape.

1 Curved surface 
– 
– 
Cone 
A cone is a 3D shape that has a flat base, and a curved surface. Similar to a cylinder, a cone can also be classified as a right circular cone and an oblique cone.

1 Curved surface and 1 face. 
1 
1 
Cylinder 
A cylinder has a height and a radius. The height of a cylinder is the perpendicular distance between the top and bottom faces.

2 circular faces, one at the top and one at the bottom, and 1 curved surface. 
2 
0 
Hemisphere 
A hemisphere has a curved surface area.

1 Curved surface and 1 face. 
1 
0 
Tetrahedron or Triangular based pyramid 
A trianglebased pyramid with equal edges and faces is called a regular tetrahedron.

4 
6 
4 
Triangular prism 
Its five faces include two triangular bases and three rectangular sides.

5 
9 
6 
Hexagonal prism 
The top and bottom bases are equal to each other in length.

8 
18 
12 
Pentagonal prism 
The base of a pentagonal prism is in the shape of a pentagon.

7

15 
10 
Cube 
Its length, width, and height are the same. 
6 
12 
8 
Cuboid 
Its length, height, and width are different. 
6 
12 
8 