Question relating to surface areas and volumes are common in BMAT exams.
It is important to know surface areas and volumes of some common shapes.
2-D shapes do not have three dimensions. therefore, they cannot have a volume.
2-D Shapes
Shape | Perimeter | Area |
Square | 4a | a² |
Rectangle | 2 (l + b) | l x b |
Circle | 2πr | πr² |
Triangle | Sum of 3 sides | ½ (b x h) |
Trapezium | Sum of 4 sides | ½ (a + b) h |

3-D Shapes:
Shape | S.A. | Volume |
Cube | 6a² | a³ |
Cuboid | 2lh + 2wh + 2lw | (l x b x h) |
Cylinder | 2πrh + 2πr² | πr²h |
Cone | πr [r + √(h²+r²)] | πr²(h ÷ 3) |
Sphere | 4πr² | ⁴⁄₃πr³ |
Hemi-sphere | 2πr² | ²⁄₃πr³ |