BY

ROHIT SAINI

WHAT ARE SHAPES

A shape is a geometrical figure tat can be described with

mathematics.

For example , two dimensional shapes like circle will fit

inside of a flat plane.

Three dimensional like cubes will not fit inside of a plane

, because they are not flat.

2-DIMENSIONAL SHAPES

These are 2D shapes or flat plane . There sides are made of straight or curved lines.

They have fixed number of lines. Plane figures are called polygons .

Triangles , squares and rectangles are example of 2D shapes.

PROPERTIES OF 2D SHAPES

Two-dimensional shapes are planer . In case of a coordinate

system of more than two dimensions , then a 2D shape would

still depend on two coordinate directions.

2D shapes include the square , the triangle , the rectangle etc.

To understand it more easily you can say that 2D shapes do not

have prominrnt or rugged parts . For example , speaking 2D

you would have a square , whereas 3D shape have a cube.

THREE DIMENTIONAL

SHAPESA 3D shape is a solid

which encloses a volume ,

and has length breadth and

height

PROPERTIES OF 3D SHAPES

Three-dimensional have four properties that apart from

two-dimensional shapes : face , vertices , edges and

volume . These property not only allow you to determine

whether the shape is two-dimensional or three-

dimensional , but also which three-dimensional shape it is

.

FACES OF A CUBEA part of shape that is flat

or curved.

A cube has six faces.

Edges of a cube

Line where two faces

meet.

A cube has 12 edges.

Vertices of a cube

A place where two faces

meet.

A cube has 12 vertices

Difference between 2D and 3D

shapes

2D shapes 3D SHAPES

2D is flat using the X and Y

(horizontal and vertical) axis the

image have only two dimension

and if turned to the side becomes

a line

3D add Z dimensions.

The third dimensions allows for

rotation and depth.

It’s essential the difference

between a painting and

sculpture.

Nets for building 3D shapes

In order to understand three dimensional shapes objects

more closely , we try to form these objects from their nets.

A net for a three dimensional shape is nothing but a sort of

skelton - outline in 2-dimension which , when folded ,

results in three dimensional shape.

Different types of nets for 3D

shapes

Different types of nets for 3D

shapes

Different types of nets for 3D

shapes

YOU