About Lesson
1. Area Formulas
| Shape |
Formula |
| Square |
A=a² |
| Rectangle |
A=l×b |
| Triangle |
A=12×b×h |
| Parallelogram |
A=b×h |
| Trapezium |
A=12×(a+b)×h |
| Rhombus |
A=12×d1×d2 |
2. Surface Area Formulas
| Shape |
Lateral Surface Area (LSA/CSA) |
Total Surface Area (TSA) |
| Cube |
4a² |
6a² |
| Cuboid |
2h(l+b) |
2(lb+bh+hl) |
| Cylinder |
2πrh |
2πr(r+h) |
3. Volume Formulas
| Shape |
Volume Formula |
| Cube |
V=a³ |
| Cuboid |
V=l×b×h |
| Cylinder |
V=πr²h |
Key Notes:
- Area is measured in square units (cm², m²).
- Surface Area covers the entire outer surface of a 3D shape.
- Volume is measured in cubic units (cm³, m³) and represents the space inside a 3D object.
