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Important Formulas used in Mensuration 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. a 2 Perimeter = 2a+d……………………….where d=a√2 Equilateral Triangle : Area = √3. a 2 /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 π