Question

menstruation formuls of class 8

Answer 1

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) =Side(S)*Side(S)

 A=S²

4. Perimeter of a square (P) = 4 × Side(S)

 P=4S

5. Area of a parallelogram(A) = Length(l) × Height(h)

 A=LH

6. Perimeter of a parallelogram (P) = 2 × (length(l) + Breadth(b))

 2(L+B)

7. Area of a triangle (A) = (Base(b) × Height(b)) / 2

And for a triangle with sides measuring “a” , “b” and “c” , Perimeter = a+b+c

and s = semi perimeter = perimeter / 2 = (a+b+c)/2

And also: Area of triangle = 1/2*B*H

This formulas is also knows as “Heron’s formula”.

 

8. Area of triangle(A) = 1/2*b*h

Where A, B and C are the vertex and angle A , B , C are respective angles of triangles and  a , b , c are the respective opposite sides of the angles as shown in figure below:

area of triangle - mensuration

 

9. Area of isosceles triangle = 

A=bhb2

Where a = length of two equal side , b= length of base of isosceles triangle.

 

10. Area of trapezium (A) = 1/2*H(A+B)

Where “a” and “b” are the length of parallel sides and “h” is the perpendicular distance between “a” and “b” .

 

11. Perimeter of a trapezium (P) = sum of all sides

 AB+BC+CD+AD

12. Area of rhombus (A) =  Product of diagonals / 2

 D1*D2

13. Perimeter of a rhombus (P) = 4 × l

where l = length of a side

 AD+AB+BC+CD=4*L

14. Area of quadrilateral (A) = 1/2 × Diagonal × (Sum of offsets)

 1/2D(H1+H2)

 

15.  Area of a Circle (A) = \pi r²

Where r = radius of the circle and d = diameter of the circle.

 

16. Circumference of a Circle = 2\pi r or \pi d

r= radius of circle

d=diameter of the circle

 

17. Total surface area of cuboid = 2(lb+bh+hl)

where l= length , b=breadth , h=height

 

18. Total surface area of cuboid = 6L²

where l= length b=breadth h=height

 

 

19. Volume of cuboid = l × b × h

 

20. Volume of cube = l × l × l

 

 EULERS FORMULA IS THAT V+F=E+2

HOPES THIS HELPS,PLEASE MARK IT AS BRAINLIEST

Answer 2

Hi friend,

Their are many formulaes,


CSA of cuboide- 2*h(l+b)
TSA-2(lb+lh+bh)
Volume-l*b*h

CSA of the cube-4a^2
TSA of the cube-6a^2
Volume- Side^3

CSA of the cylinder- 2*pi*r*h
TSA of the cylinder- 2*pi*r(r+h)
Volume- pi*r^2*h

Area of trapezium- 1/2*(sum of parallel sides)*h

Area of rhombus with diagnols- 1/2*d1*d2

Area of a parallelogram- l*h

Area of rectangle- l*b
Perimeter of rectangle- 2(l+b)

Area of a square- side*side
Perimeter of a square- 4*side



Hope it helped you.........
More i will just give after sometime.........