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# Mensuration for class 9 cbse

## by Ayush Vaths on Feb 22, 2013

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## Mensuration for class 9 cbsePresentation Transcript

• EXAMPLE OF PLANE AND 3D FIGURES PLANE FIGURES 3D FIGURES SQUARE CUBE RECTANGLE CUBOID TRAPEZIUM CYLINDER HEXAGON CONE OCTAGON SPEHERE PENTAGON HEMISPHERE CIRCLE PRISM
• WHAT ARE 2D OR PLANE FIGURES ?Plane figures are flat two- dimensional(2D) shape. A plane figure can be made ofstraight lines, curved lines, or both straighand curved lines.
• WHAT ARE 3D FIGURES ?A 3D figure is a figure that has height,depth, and width. Such a figure does notlie entirely in a plane.
• AREA OF 2D FIGURES
• AREA OF SQUARE The Area is the sideArea of a Square = length squared: Area = a2
• Parallelogram The Area isArea of a Parallelogram = the base times the height: Area = b × h (h is at right angles to b)
• Triangles The area is half of the base times height. •"b" is the distance along the base •"h" is the height (measured at right angles to the base) Area = ½ × b × h
• Rectangle The Area isArea of a the width timesRectangle = the height: Area = w × h
• The area of a circle is• π (Pi) times the Radius squared, which is written: A = π × r2
• VOLUME AND SURFACE AREA OF CUBE
• VOLUME AND SURFACE OF CUBOIDVOLUME OF CUBOID = L*B*HT.S.A OF CUBOID =2∏r(r+h)C.S.A OF A CUBOID =2∏rh
• VOLUME AND SURFACE OF cylinder
• VOLUME AND SURFACE OF RIGHT CIRCULAR CONE
• VOLUME SURFACE OF SPEHERE
• VOLUME AND SURFACE OF HEMISPEHERE
• GROUP MEMBERS NAME