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PROJECT WORK OF MATHS:

PROJECT WORK OF MATHS KENDRIYA VIDYALAYA GINGLE , URI NAME – ATUL TYAGI CLASS -VII ROLLNO. - 10

PowerPoint Presentation:

2) TOPIC - VISUALISING SOLID SHAPES WELCOME

DIMENSIONAL FIGURES :

DIMENSIONAL FIGURES PLANE FIGURES Plane figure have 2 dimension like length and breadth or radius . These figures are called 2 dimensional figures or 2-D. EXAMPLE Rectangle ,circle , square and triangle

SOME EXAMPLES OF PLANE FIGURES:

SOME EXAMPLES OF PLANE FIGURES CIRCLE RECTANGLE TRIANGLE SQUARE z

3 DIMENSIONAL FIGURES:

3 DIMENSIONAL FIGURES SOLID OBJECTS A solid object having 3 dimensions like length , breadth , height [depth or thickness] is called 3 dimensional object or 3 – d figure. Example Cube , cuboids , cylinder and cone

SOME EXAMPLES OF SOLID OBJECTS:

SOME EXAMPLES OF SOLID OBJECTS

WHAT IS CUBE ?:

WHAT IS CUBE ? A cuboid whose length , breadth and height are equal is called a cube. example Sugar cube and dice are example of cube.

SOME EXAMPLES OF CUBE:

SOME EXAMPLES OF CUBE

WHAT IS CUBOID ?:

WHAT IS CUBOID ? A cuboid has length , breadth and height and its opposite faces are identical . EXAMPLE A wooden box and a matchbox are some example.

SOME EXAMPLES OF CUBOID:

SOME EXAMPLES OF CUBOID

WHAT IS SPHERE ?:

WHAT IS SPHERE ? A sphere has a curved surface . It Has no vertex and no edge. An object which is in the shape of a ball is said to have a shape of a sphere.

SOME EXAMPLES OF SPHERE:

SOME EXAMPLES OF SPHERE

WHAT IS CONE ?:

WHAT IS CONE ? A cone has a plane circular end as the base and a curved surface tapering into a point , called its vertex . Thus , a cone has one plane face and one curved face . It has one circular edge and one vertex. EXAMPLE An ice-cream cone and clown’s cap.

SOME EXAMPLES OF CONE:

SOME EXAMPLES OF CONE

WHAT IS CYLINDER?:

WHAT IS CYLINDER? A cylinder has a curved lateral surface and two circular faces at its end. It has no corner or vertex. A cylinder has two plane faces , namely the top and the base , and one curved face . It has two circular edges. EXAMPLE A circular pipe and gas cylinder.

SOME EXAMPLES OF CYLINDER:

SOME EXAMPLES OF CYLINDER

VIEWS OF 3 - D SHAPES:

VIEWS OF 3 - D SHAPES 3-Dimensional objects can look differently from different positions so they can be drawn from different perspectives.

DIFFERENT VIEWS OF OBJECTS A PYRAMID FRONT VIEW TOP VIEW SIDE VIEW :

DIFFERENT VIEWS OF OBJECTS A PYRAMID FRONT VIEW TOP VIEW SIDE VIEW

WE CAN ALSO GET DIFFERENT VIEWS OF FIGURES MADE BY JOINING CUBES. 1. FRONT VIEW TOP VIEW SIDE VIEW :

WE CAN ALSO GET DIFFERENT VIEWS OF FIGURES MADE BY JOINING CUBES. 1. FRONT VIEW TOP VIEW SIDE VIEW

2. TOP VIEW FRONT VIEW SIDE VIEW :

2. TOP VIEW FRONT VIEW SIDE VIEW

FACES , EDGES AND VERTICES:

Faces Each of solid is made up of polygonal regions which are called its faces . Edges When any two faces of the solid meet together we get a line segment called an edge. FACES , EDGES AND VERTICES

:

Vertex When three or more faces meet at one point , that point is called a vertex. FRONT VIEW

FACES , EDGES AND VERTICES OF CUBE:

FACES , EDGES AND VERTICES OF CUBE A cube has 8 vertices , 12 edges and 6 faces.

FACES , EDGES AND VERTICES OF CUBOID:

A cuboids has 6 faces , 8 vertices and 12 edges FACES , EDGES AND VERTICES OF CUBOID

FACES , EDGES AND VERTICES OF RECTANGULAR PYRAMID :

FACES , EDGES AND VERTICES OF RECTANGULAR PYRAMID A Rectangular pyramid has 5 faces , 8 edges and 5 vertices .

FACES , EDGES AND VERTICES OF triangular pyramid :

FACES , EDGES AND VERTICES OF triangular pyramid A triangular pyramid has 4 faces , 6 edges and 4 vertices.

NET OF SQUARE BASED PYRAMID:

NET OF SQUARE BASED PYRAMID

Surface area and volume of 3-dimensional Figures:

Surface area and volume of 3-dimensional Figures

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Top Right Side Front Bottom Top Front Back Right Side Left Side Cuboid A Cuboid has 6 faces.. Each face is a rectangle . Front

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face face face Cube is also having 6 faces ( Here three faces are visible ) 1 2 3 Dice (Pasa) cube

Surface area and volume of 3-dimensional Figures:

Surface area and volume of 3-dimensional Figures

PowerPoint Presentation:

Top Right Side Front Bottom Top Front Back Right Side Left Side Cuboid A Cuboid has 6 faces.. Each face is a rectangle . Front

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face face face Cube is also having 6 faces ( Here three faces are visible ) 1 2 3 Dice (Pasa) cube

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Surface area = Area of all six faces = 6a 2 a Surface area Cube cuboid Surface area = Area of all six faces = 2(lxb + bxh +hxl) a a a (Here all the faces are square) (Here all the faces are rectangular) h l b

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Area of base (Rectangle) = l x b l Height of cuboid = h Volume of cuboid = Area of base x height = (l x b) x h =lXbXh h Volume of cuboid Front b

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Volume of Cube a a Area of base (square) = a 2 Height of cube = a Volume of cube = Area of base x height = a 2 x a = a 3 a a

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2 π r h r h Curved Surface area of cylinder = Area of rectangle= 2 π rh Method of Finding Curved Surface area of Cylinder r

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Total Surface Area of a Cylinder = (2 π r) x( h) + 2 π r 2 Curved surface Area of curved surface + area of two circular surfaces circular surfaces = 2 π r( h+ r)

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Circumference of circle = 2 π r Area covered by cylinder = curved Surface area of of cylinder = (2 π r) x( h) r h Method of finding Curved Surface area of cylinder It is the area covered by the outer surface of a cylinder. Formation of Cylinder by bangles Circumference of circle = 2 π r r

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Volume of cylinder Volume of cylinder = Area of base x vertical height = π r 2 xh r h

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Curved Surface Area of Cone Base r h l = Slant height Curved Surface Area of a Cone = π r l where l = √ ( r²+h ² )

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3( V ) = π r 2 h r h h r Volume of a Cone Here the vertical height and radius of cylinder & cone are same. 3( volume of cone) = volume of cylinder V = 1/3 π r 2 h

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If both cylinder and cone have same height and radius then volume of a cylinder is three times the volume of a cone , Volume = 3V Volume =V

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4( 1/3 π r 2 h ) = 4( 1/3 π r 3 ) = V h=r r Volume of a Sphere Here the vertical height and radius of cone are same as radius of sphere . 4( volume of cone) = volume of Sphere V = 4/3 π r 3 r

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Surface area 6a 2 2 π rh π r l 4 π r 2 Volume a 3 π r 2 h 1/3 π r 2 h 4/3 π r 3 Comparison of Area and volume of different geometrical figures

NOW QUESTION TIME:

Q1- FOOTBALL IS AN EXAMPLE OF ? NOW QUESTION TIME CUBE CONE SPHERE NONE OF THESE

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RIGHT ANSWER

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WRONG ANSWER

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WHICH OF THESE IS A EXAMPLE OF CUBE PIPE SUN NONE OF THESE DICE

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RIGHT ANSWER

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WRONG ANSWER

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The End

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