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CBSE Class 9 Maths Notes for Chapter 12 Surface Areas and Volumes

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CHAPTER 12 SURFACE AREAS AND VOLUMES

 

Surface area of:

  • Cuboid: 2(lb + bh + hl)
  • Cube: 6a2 , where a = edge of the cube.
  • Cylinder:
    • Curved surface area= 2πrh
    • Total surface area= 2πr(r + h)
  • Cone:
    • Curved surface area= x l x 2πr = πrl
    • Total surface area= πrl + πr2 = πr(l + r)
  • Sphere: 4πr2
  • Hemisphere:
    • Curved surface area= 2πr2
    • Total surface area= 3πr2

 

Volume of:

  • Cuboid: l x b x h
  • Cube: a3 , where a= edge of the cube
  • Cylinder: πr2h
  • Cone: πr2h
  • Sphere: πr3
  • Hemisphere: πr3

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