Maths Formulas For Class 8
Maths formulas for class 8 list provided here consolidates all the important formulas that are required in class 8. These maths formulas will help students to solve questions easily and in a more effective way.
Most of the students of class 8 feel that formulas are difficult to grasp and remember. However, when the logic behind problem and formulas are understood properly, solving any kind of Maths problem becomes easier. If the students are confident with all the below-mentioned formulas, they can easily solve different variations of questions and get acquainted with the concepts better.
Class 8 Maths Formulas List
All the class 8 formulas in Maths are segregated into two types here which are Geometry formulas and Algebra formulas. The common and the most important Maths class 8 formulas are mentioned in the tables given below.
Geometry Formulas for Class 8
To recall, geometric shapes are of two types which are 2D shapes and 3D shapes (or solid shapes). The list for all the 2D and 3D geometric shapes are:
Geometry Shapes Formulas for Solid Shapes:
| Name of the Solid | Lateral / Curved Surface Area | Total Surface Area | Volume |
|---|---|---|---|
| Cuboid | 2h (l + b) | 2 (lb + bh + hl) | l × b × h |
| Cube | 4a2 | 6a2 | a3 |
| Right Prism | Perimeter of Base × Height | Lateral Surface Area + 2(Area of One End) | Area of Base × Height |
| Right Circular Cylinder | 2 (π × r × h) | 2πr (r + h) | πr2h |
| Right Pyramid | ½ (Perimeter of Base × Slant Height) | Lateral Surface Area + Area of the Base | ⅓ (Area of the Base) × Height |
| Right Circular Cone | πrl | πr (l + r) | ⅓ (πr2h) |
| Sphere | 4πr2 | 4πr2 | 4/3 (πr3) |
| Hemisphere | 2πr2 | 3πr2 | ⅔ (πr3) |
Geometry Shapes Formulas for 2D Shapes:
| Geometric Area | Geometric Area Formula |
|---|---|
| Square | a2 |
| Rectangle | a × b |
| Circle | πr2 |
| Ellipse | πr1r2 |
| Triangle | ½(b × h) |
- Algebra Formulas for Class 8
Some important 8th class formulas related to Algebra are:
| Algebraic Identities For Class 8 | |
|---|---|
| (a + b)2 = a2 + 2ab + b2 | |
| (a − b)2 = a2 − 2ab + b2 | |
| (a + b) (a – b) = a2 – b2 | |
| (x + a) (x + b) = x2 + (a + b)x + ab | |
| (x + a) (x – b) = x2 + (a – b)x – ab | |
| (x – a) (x + b) = x2 + (b – a)x – ab | |
| (x – a) (x – b) = x2 – (a + b)x + ab | |
| (a + b)3 = a3 + b3 + 3ab (a + b) | |
| (a – b)3 = a3 – b3 – 3ab (a – b) | |
