. 7th class math formulas


Best Answer

Important Math Formulas for Class 7 is given below:

ax / ay = ax-y

ax /bx = (a/b)x

(ax)y = axy

(a-b-c)2 = a2 + b2 + c2 - 2ab + 2bc - 2ac

Increase in Percentage = (Change / Original Amount) × 100

Profit percent = (Profit / Cost price) × 100

Simple Interest = (Principal × Rate × Time) / 100

Amount = Principal + Interest

Pythagoras Theorem:

(Hypotenuse)2 = (Adjacent Side)2 + (Opposite Side)2

Area of a Circle = πr 2, where 'r' is the radius of a circle and π = 22/7 or 3.14

cos 390

Sol.390 degrees = 390° × (π/180°) rad = 13π/6 or 6.8067 . . .

 cos 390° = cos (6.8067) = √3/2 or 0.8660254. . .

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