Important Formulas used in Mensuration

Hello Readers,

Mensuration is one of the topics in Quants. Now a days questions coming from this chapter also. Here we are providing you Some important formulas which is used in mensuration which are useful in SSC, Railways and other exams.

Rectangle :

  • Area = lb
  • Perimeter  = 2(l+b)

Square :

  • Area = a×a
  • Perimeter = 4a

Parallelogram

  • Area = l × h
  • Perimeter = 2(l+b)

Triangle :

  • Area =b×h/2 or √s(s-a)(s-b)(s-c)…………….where s=a+b+c/2

Right angle Triangle :

  • Area =1/2(bh)
  • Perimeter = b+h+d

Isosceles right angle triangle :

  • Area = ½. a2
  • Perimeter = 2a+d……………………….where d=a√2

Equilateral Triangle :

  • Area = √3. a2/4 or  ½(ah)….where h = √3/2
  • Perimeter = 3a

Trapezium :

  • Area = 1/2h(a+b)
  • Perimeter = Sum of all sides

Rhombus :

  • Area = d1 × d2/2
  • Perimeter = 4l

Quadrilateral

  • Area =1/2 × Diagonal × (Sum of offsets)

Kite :

  • Area  = d1×d2/2
  • Perimeter  = 2 × Sum on non-adjacent sides

Circle :

  • Area =  πr^2 or πd^2/4
  • Circumference = 2πr  or πd
  • Area of sector of a circle = (θπr^2 )/360

Frustum :

  • Curved surface area = πh(r1+r2)
  • Surface area = π( r12+ h(r1+r2) + r22)

Cube :

  • Volume: V = l3
  • Lateral surface area = 4a2
  • Surface Area: S = 6s2
  • Diagonal (d) = √3l

Cuboid :

  • Volume of cuboid: lbh
  • Total surface area = 2 (lb + bh + hl) or 6l2
  • Length of diagonal =√(l^2+b^2+h^2)

Right Circular Cylinder :

  • Volume of Cylinder = π r2 h
  • Lateral Surface Area (LSA or CSA) = 2π r h
  • Total Surface Area = TSA = 2 π r (r + h)
  • Volume of hollow cylinder = π r h(R2 – r2)

Right Circular cone :

  • Volume = 1/3 π r2h
  • Curved surface area: CSA=  π r l
  • Total surface area = TSA = πr(r + l )

Sphere

  • Volume: V = 4/3 πr3
  • Surface Area: S = 4πr2

Hemisphere :

  • Volume = 2/3 π r3
  • Curved surface area(CSA) = 2 π r2
  • Total surface area = TSA = 3 π r2

Prism :

  • Volume = Base area x h
  • Lateral Surface area = perimeter of the base x h

Pyramid:

  • Volume of a right pyramid = (1/3) × area of the base × height.
  • Area of the lateral faces of a right pyramid = (1/2) × perimeter of the base x slant height.
  • Area of whole surface of a right pyramid = area of the lateral faces + area of the base.

Tetrahedron :

  • Area of its slant sides = 3a2√3/4
  • Area of its whole surface = √3a2 
  • Volume of the tetrahedron = (√2/12) a 3

Regular Hexagon :

  • Area =  3√3 a2 / 2
  • Perimeter  = 6a

Some other Formula :

  • Area of Pathway running across the middle of  a rectangle = w(l+b-w)
  • Perimeter of Pathway around a rectangle field = 2(l+b+4w)
  • Area of Pathway around a rectangle field =2w(l+b+2w)
  • Perimeter of Pathway inside a rectangle field =2(l+b-4w)
  • Area of Pathway inside a rectangle field =2w(l+b-2w)
  • Area of four walls = 2h(l+b)

Note : If we missed anything please mention it, we will update it





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