Mensuration Formulas Class 8 Math

Hey, students are you looking for all formulas of Mensuration or Mensuration formulas in class 8 Math? If yes. Then you are at the right place. In this post, we have listed all the formulas of Mensuration class 8 that you can use to learn and understand the concepts easily.

If you want to improve your class 8 Math mensuration concepts, then it is super important for you to learn and understand all the formulas.

By using these formulas you will learn how to find the area of a rectangle, the perimeter of a rectangle, the area of a quadrilateral, the area of a parallelogram, the area of a circle, the Surface area of a cube, the Surface area of a cube, Volume of Diagonal of the cube, and many more.

With the help of these formulas, you can revise the entire chapter easily.

Mensuration formulas class 8 Math

Area and perimeter of Rectangle and Square

1. Area of rectangle (A) = length(l) × Breath(b), A = l× b
2. Perimeter of a rectangle (P) = 2 × (Length(l) + Breath(b)), P = 2 × (l + b)
3. Area of a square (A) = Length (l) × Length (l), A = l×l
4. Perimeter of a square (P) = 4 × Length (l), P = 4 × l
5. Area of a quadrilateral = 1/2 d(h1 + h2) square unit, where, d denotes the length of diagonal AC.
6. Area of parallelogram = Base $\times$ Height square unit.
7. Area of trapezium $=\frac{1}{2} \times[$ Sum of parallel sides $] \times$ Height square unit.
8. Area of an equilateral triangle $=\frac{\sqrt{3}}{4} \times(\text { Side })^{2}$ square unit.
9. Area of a triangle $=\frac{1}{2} \times$ Base $\times$ Height square unit.
10. The perimeter of a circle is called its circumference.
11. The number $\pi$ is not a rational number. It is often used as a rational approximation and its value is $\frac{22}{7}$
12. The ratio of the circumference of a circle to its diameter is always constant and denoted by the Greek letter $\pi$. Thus, $\frac{c}{d}=\pi$. The value of $\pi$ is $3.14$ correct to two decimal places.
13. Area of a circle $=\pi \times$ (Radius) $^{2}=\pi r^{2}$ square unit.
14. Circumference of a circle $=2 \pi \times$ Radius $=2 \pi r$ unit.
15. Area of rhombus $=\frac{1}{2}$ (Product of diagonals) $=\frac{1}{2} \times \mathrm{d}_{1} \times \mathrm{d}_{2}$ square unit.
16. Surface area of a cuboid $=2[\mathrm{lb}+\mathrm{bh}+\mathrm{hl}]$ square unit
17. Surface area of a cube $=6 \mathrm{I}^{2}$ square unit
18. Surface area of a cylinder $=2 \pi r(h+r)$ square unit
19. Surface area of Diagonal of cuboid $=\sqrt{l^{2}+b^{2}+h^{2}}$ units
20. Surface area of Lateral surface area of cuboid $=[2(l+b) \times h]$ square unit
21. Surface area of Lateral surface area of the cube $=4 a^{2}$ square unit
22. Surface area of Lateral (curved) surface area of a cylinder $=2 \pi$ rh square unit
23. Volume of Cuboid $=\mid \times \mathrm{b} \times \mathrm{h}$ (unit) $^{3}$
24. Volume of Cube $=I^{3}$ (unit) $^{3}$
25. Volume of Cylinder $=\pi r^{2} h$ (unit) $^{3}$
26. Volume of Diagonal of the cube $=(\sqrt{3} a)$ units.
27. $1 \mathrm{~m}^{2}=100 \mathrm{dm}^{2}=10000 \mathrm{~cm}^{2}$
28. $1 \mathrm{~cm}^{2}=100 \mathrm{~mm}^{2}$
29. Area of a trapezium $=\frac{1}{2}$ (sum of parallel sides) $\times$ height
30. Total surface area of a cuboid $=2(\mathrm{lb}+\mathrm{bh}+\mathrm{hl})$
31. Lateral (curved) surface area of a cylinder $=2 \pi r h$
32. Total surface area of a cylinder $=2 \pi r(h+r)$
33. Volume of cuboid $=$ Ibh OR Volume of cuboid $=$ area of the base $\times$ height
34. Total surface area of a cube $=6I^{2}$, where $I$ is the side of the cube.
35. Volume of cylinder $=\pi r^{2} h$

Also Read,

Download NCERT Class 8 Math Book PDF

Download NCERT Class 8 Science Book PDF

Download NCERT Class 8 Science Exemplar PDF

Download NCERT Class 8 Math Exemplar PDF

If you have any Confusion related to Mensuration formulas class 8 Math then feel free to ask in the comments section down below.

To watch Free Learning Videos on Class 8 Math by Kota’s top Faculties Install the eSaral App