CBSE Class 9 Maths Notes for 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