Question

Give me all important formlae of the chapter Surface areas and volumes

Answer 1

1. Surface area of a cuboid = 2 (lb + bh + hl) 2. Surface area of a cube = 6a2 3. Curved surface area of a cylinder = 2πrh 4. Total surface area of a cylinder = 2πr(r + h) 5. Curved surface area of a cone = πrl 6. Total surface area of a right circular cone = πrl + πr 2 , i.e., πr (l + r) 7. Surface area of a sphere of radius r = 4 π r 2 8. Curved surface area of a hemisphere = 2πr 2 9. Total surface area of a hemisphere = 3πr2 10. Volume of a cuboid = l × b × h 11. Volume of a cube = a3 12. Volume of a cylinder = πr 2 h 13. Volume of a cone = 1 3 πr 2h 14. Volume of a sphere of radius r = 4 3  3 r 15. Volume of a hemisphere = 2 3 3  r

Answer 2

Answer:

Curved Surface Area = π(r 1 + r 2 )l.

Total Surface Area =π(r 1 + r 2 )l + πr 1^ 2 + πr 2 ^2

Volume = 1/3 πh (r 1^ 2 + r 2 ^2 + r 1 r 2 )