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 |
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