shapesshapes

shapesshapes

D stands for DIMENSIONSD stands for DIMENSIONS

The 2 dimensions are :The 2 dimensions are :i.i. Lengths Lengthsii.ii. WidthWidth

Shapes with these 2 dimensions are calledShapes with these 2 dimensions are called2D SHAPES2D SHAPES..

The face of every 2D shapes are The face of every 2D shapes are FLATFLAT..

What are 2D shapes ?

What is a 2D shape ?

L

W

L

W

L

W

L – The length of the shape

W – The width of the shapeThe faces are FLAT.

Face Corner

Straight line

Parts of a 2D shapes

Angle

Face Corner ?

Curve side

Parts of a 2D shapes

x

Anglex

circle

Names of 2D shapes

circle

square

square

triangle

triangle

oval

oval

rectangle

rectangle

pentagon

pentagon

hexagonhexagon heptagonheptagon octagonoctagon

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : CircleFace : RoundSides : Curve sideCorner : 0Angle : 0

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : SquareFace : SquareSides : Straight sidesCorner : 4Angle : 4

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : TriangleFace : TriangularSides : Straight sidesCorner : 3Angle : 3

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : OvalFace : OvalSides : Curve sideCorner : 0Angle : 0

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : RectangleFace : RectangularSides : Straight sidesCorner : 4Angle : 4

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : PentagonFace : PentagonSides : Straight sidesCorner : 5Angle : 5

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : HexagonFace : HexagonSides : Straight sidesCorner : 6Angle : 6

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : HeptagonFace : HeptagonSides : Straight sidesCorner : 7Angle : 7

Names of 2D shapes

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

circle square triangle

oval rectangle pentagon

hexagon heptagon octagon

Name : OctagonFace : OctagonSides : Straight sidesCorner : 8Angle : 8

Face Corner

Straight line

Parts of a 2D shapes

Angle

Face Corner

Straight line

Parts of a 2D shapes

Angle

Face Corner ?

Curve side

Parts of a 2D shapes

x

Parts of a 2D shapes

Face Corner

Straight line Angle

Parts of a 2D shapes

Face Corner

Curve side

x

Guess what shape is this

It has 3 straight sides and 3 corners…

Answer : Triangle

Guess what shape is this

It has 4 equal sides and 4 corners…

Answer : Square

Guess what shape is this

It has a round face. It has no

corners…

Answer : Circle

Guess what shape is this

It has 4 corners and 4 sides. 2 of

the sides are longer…

Answer : Rectangle

Fill in the blanks

Name :

Face :

Sides :

Corners :

Square

square

4 equal sides

4

Fill in the blanks

Name :

Face :

Sides :

Corners :

Rectangle

Rectangular

4 straight sides2 sides longer

4

Fill in the blanks

Name :

Face :

Sides :

Corners :

Triangle

Triangular

3 straight sides

3

Fill in the blanks

Name :

Face :

Sides :

Corners :

Circle

Round

A curve side

No corners

Fill in the blanks

Name :

Face :

Sides :

Corners :

Oval

Oval

A curve side

No corners

Characteristic of prisms

Types of 2D shapes ?

There are 2 types of 2D shapes :1. polygon2. non-polygon

Polygons are 2D shapes with only straight sides.

2D shapes which have curved side are

called non-polygons.

What are polygons?

Polygons are 2D shapes with only straight sides.

Examples :Straight lines

What are polygons?

Shapes with curve sides are not polygons.

Examples :Curve sides

State whether these shapes are polygons

Exercise

√ √ x √

√ √ x x

x

√

Are these polygons or non-polygons ?

Answer

Are these polygons or non-polygons ?

√x √

√ x x

shapesshapes

The 3 dimensions are :The 3 dimensions are :i.i. Lengths (L)Lengths (L)ii.ii. Width (W)Width (W)iii.iii. Depth (D)Depth (D)

Shapes with these 3 Shapes with these 3 dimensions are called dimensions are called 3D SHAPES3D SHAPES..

The face of a 3D shapes can be The face of a 3D shapes can be FLAT FLAT or or curvecurve..

What are 3D shapes ?

L

WD

Names of 3D shapes

cube sphere cylinder

cone pyramid

Characteristic of prisms

1. Have at least 2 identical bases

2.Have straight sides

3.Have faces other than the bases in rectangular shapes

Squareprism

Types of 3D shapes

Parts of 3D shapes

Face

Base

Vertex

Edge

Rectangularprism

Types of 3D shapes

Triangularprism

Types of 3D shapes

lineslines&shapesshapes

Are these shapes symmetry?

How to indicate symmetrical shapes

When the shape is cut out in two, are the cutouts the same?

How to indicate symmetrical shapes

same

When the shape is cut out in two, are the cutouts the same?

How to indicate symmetrical shapes

same

When the shape is cut out in two, are the cutouts the same?

How to indicate symmetrical shapes

same

Circle is a symmetrical shape.

How to indicate symmetrical shapes

The symmetry lines are many.

Is a square a symmetrical shape?

How to indicate symmetrical shapes

How to indicate symmetrical shapes

So, is a square a symmetrical shape?

How to indicate symmetrical shapes

yes

How to indicate symmetrical shapes

So, is a triangle a symmetrical shape?

How to indicate symmetrical shapes

yes

State whether these shapes are symmetrical or not

Exercise

√ √ √ √

√ √ √ x

x

x