Question

formulas of 9th class maths

Answer 1

Answer:

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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