Math, asked by BahaWaris, 10 months ago

i need the important formulas in maths for class 7​

Answers

Answered by riya3314
2

Proportion Formula Rules:

Addition: ab+cd=ad+bcbd

Subtraction: ab−cd=ad−bcbd

Multiplication:ab=cd, then a*d = b*c

Division : abcd=adbc

Set properties:

Commutative property: A∪B=B∪A A∩B=B∩A

Associative property:(A∪B)∪C=A∪(B∪C) (A∩B)∩C=A∩(B∩C)

Algebraic Expression Expansion:

(a+b)2=a2+2ab+b2

(a−b)2=a2−2ab+b2

a2−b2=(a+b)(a−b)

(x+a)(x+b)=x2+x(a+b)+(ab)

Consumer Math Formulas:

Simple Interest, S.I=PTR100,

Where P=Principal, T= Time in years,R=Rate of interest per annum

Rate,R=100∗S.IP∗T

Principal,P=100∗S.IR∗T

Time,T=100∗S.IR∗P

Discount = MP-SP

Principal = Amount – Simple Interest

If Rate of Discount is given, Discount=PastRateofDiscount100

Time and Speed:

Speed=DistancetravelledTimetaken

NumberofRevolution=DistancetravelledCircumferenceofthewheel

Area Formulas for 2D and 3D Figures:

Circle=pir2 Sq units, where r is the radius

Rectangle= l∗b Sq.units , where l = length and b is breadth

Total Surface Area for Cube = 6a2 sq.units

Total surface Area of cuboid =2(lb+bh+hl) Sq.units

Perimeter Formulas

Square = 4s units, where s is side of square

Rectangle= 2(l+b) units, where l is length and b is breadth

Volume Formulas:

Cube =l3 cu.units

Sphere=43πr3 cu.units,where r is the radius of the sphere.

Cylinder= πr2h cu.units,where r is the radius of the base,h is the height of the cylinder.

Answered by Anonymous
0

\huge\bf{Answer:-}

Chapters of maths class 7th

Chapter 1 – Integers Formulas.

Chapter 2 – Fractions and Decimals Formulas.

Chapter 3 – Data Handling Formulas.

Chapter 5 – Lines and Angles Formulas.

Chapter 6 – The Triangle and Its Properties Formulas.

Chapter 7 – Congruence of Triangles Formulas.

Chapter 9 – Rational Numbers Formulas.

Go though the last page of each lesson on maths text book the list of points and important formulas are given:

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