Question

all formula of class 9math chapter surface area and volume

Answer 1

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Answer 2

1. Surface area of a cuboid
$2(lb + bh + hl)$


2. Surface area of a cube
$6 {a}^{3}$

3. Curved surface area of a cylinder
$2\pi \: rh$

4. Total surface area of a cylinder
$2\pi \: r \:( r + h)$

5. Curved surface area of a cone
$\pi \: rl$

6. Total surface area of a right circular cone
$\pi \: r(l + r)$
Or
$\pi \: r + \pi {r}^{2}$

7. Surface area of a sphere
$4\pi {r}^{3}$

8. Curved surface area of a hemisphere
$2\pi {r}^{2}$

9. Total surface area of a hemisphere
$3\pi {r}^{2}$

10. Volume of a cuboid
$lbh$

11. Volume of a cube
${a}^{3}$

12. Volume of a cylinder
$\pi \: {r}^{2} h$

13. Volume of a cone
$\frac{1}{3} \pi \: {r}^{2} h$

14. Volume of sphere of radius r
$\frac{4}{3} \pi {r}^{3}$

15. Volume of a hemisphere
$\frac{2}{3} \pi \: {r}^{3}$