 ### Mensuration Formulas

Mensuration        formulae
அளவையியல்      சூத்திரங்கள்

 Area of circle Area of circle = Π r ² Circumference of circle = 2 Π r Area of triangle Area of Equilateral-triangle = (√3/4) a² Perimeter of Equilateral-triangle = 3a Area of scalene triangle Area of scalene triangle = √s(s-a)(s-b)(s-c) Perimeter of scalene triangle  = a + b +  c Area of semicircle Area of Semi circle= (1/2) Π r² Perimeter of semi-circle = Πr Area of quadrant Area of quadrant = (1/4) Π r² Area of rectangle Area of rectangle = L x W Perimeter of rectangle=2(l+w) Area of square Area of square = a² Perimeter of square = 4a Area of parallelogram Area of parallelogram = b x h Area of quadrilateral Area of quadrilateral=(1/2) x d x (h₁+h₂) Area of rhombus Area of rhombus =(1/2) x (d₁ x d₂) Area of trapezoid Area of trapezoid =(1/2) (a + b) x h Area of sector Area of the sector = (θ/360) x Π r ² square units (or)  Area of the sector = (1/2) x l r square units    Length of arc = (θ/360) x 2Πr

 Cylinder Curved surface area = 2 Π r h Total Curved surface area = 2 Π r (h+r) Volume = Π r²h Cone Curved surface area = Π r l Total Curved surface area = Π r (L+r) Volume = (1/3)Π r²h L² = r² + h² Sphere Curved surface area = 4Π r² Volume = (4/3)Π r³ Hemisphere Curved surface area = 2Π r² Total Curved surface area=3Π r² Volume = (2/3)Π r³ Cuboid Curved surface area=4h(l+b) Total surface area = 2(lb+bh+h l) Volume = l x b x h Cube Curved surface area=4a² Total surface area = 6a² Volume = a³

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