formulas of 9th class maths
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Class 9 math includes topics of Number System, Polynomials in algebra, Solid Geometry, Statistics and Probability. Some of the important formulas from these topics can be seen below:
(a + b) (a - b) = a2 - b2
(a + b)2 = a2 + 2ab + b2
(a - b)3 = a3 - b3 - 3ab(a - b)
Curved Surface Area of a Cone = 1 /2 × l × 2πr = πrl, 'l' = √(r2 + h2)
Volume of a Cone = (1 / 3 )πr2h
Volume of a Sphere = (4/3) πr3
Volume of a Hemisphere = (2/3) πr3
Mean = Sum of the observations / Total number of observations
Experimental Probability Formula: The trial counts in which the event (E) has occurred / The sum of trials
Step-by-step explanation:
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