Mensuration formulas class 8 Maths
Hey, students are you looking for all formulas of Mensuration or Mensuration formulas class 8 Maths? 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 about how to find the area of the rectangle, perimeter of a rectangle, the area of a quadrilateral, area of a parallelogram, the area of a circle, Surface area of a cube, 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 Maths

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 $=\pi r^{2} h$