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Mensuration for class 9 cbse

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Mensuration for class 9 cbse

1. 1. EXAMPLE OF PLANE AND 3D FIGURES PLANE FIGURES 3D FIGURES SQUARE CUBE RECTANGLE CUBOID TRAPEZIUM CYLINDER HEXAGON CONE OCTAGON SPEHERE PENTAGON HEMISPHERE CIRCLE PRISM
2. 2. 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.
3. 3. 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.
4. 4. AREA OF 2D FIGURES
5. 5. AREA OF SQUARE The Area is the sideArea of a Square = length squared: Area = a2
6. 6. Parallelogram The Area isArea of a Parallelogram = the base times the height: Area = b × h (h is at right angles to b)
7. 7. 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
8. 8. Rectangle The Area isArea of a the width timesRectangle = the height: Area = w × h
9. 9. The area of a circle is• π (Pi) times the Radius squared, which is written: A = π × r2
10. 10. VOLUME AND SURFACE AREA OF CUBE
11. 11. 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
12. 12. VOLUME AND SURFACE OF cylinder
13. 13. VOLUME AND SURFACE OF RIGHT CIRCULAR CONE
14. 14. VOLUME SURFACE OF SPEHERE
15. 15. VOLUME AND SURFACE OF HEMISPEHERE
16. 16. GROUP MEMBERS NAME