Surface Area and Volume Formulas for grade 9
Following maths formulas for class 9 are essential to solve mensuration questions.
| Shape | Surface Area | Volume |
| Cuboid | 2(lb + bh +lh) l= length, b=breadth, h=height | lbh |
| Cube | 6a2 a = side of the cube | a3 |
| Cylinder | 2πr(h+r) r = radius of circular bases h = height of cylinder | πr2h |
| Cone | πr(l+r) r=radius of base l=slant height Also, l2=h2+r2, where h is the height of cone | (1/3)πr2h |
| Sphere | 4πr2 | (4/3)πr3 |