Filter Formulas
Identity I
Formula Easy(x + y)2 = x2 + 2xy + y2
Variables:
x, y
CBSE
Class IX
Mathematics
Polynomials
Identity II
Formula Easy(x – y)2 = x2 – 2xy + y2
Variables:
x, y
CBSE
Class IX
Mathematics
Polynomials
Identity III
Formula Easyx2 – y2 = (x + y)(x – y)
Variables:
x, y
CBSE
Class IX
Mathematics
Polynomials
Identity IV
Formula Easy(x + a)(x + b) = x2 + (a + b)x + ab
Variables:
x, a, b
CBSE
Class IX
Mathematics
Polynomials
Identity V
Formula Medium(x + y + z)2 = x2 + y2 + z2 + 2xy + 2yz + 2zx
Variables:
x, y, z
CBSE
Class IX
Mathematics
Polynomials
Identity VI
Formula Medium(x + y)3 = x3 + y3 + 3xy(x + y)
(x + y)3 = x3 + 3x2y + 3xy2 + y3
Variables:
x, y
CBSE
Class IX
Mathematics
Polynomials
Identity VII
Formula Medium(x – y)3 = x3 – y3 – 3xy(x – y)
(x – y)3 = x3 – 3x2y + 3xy2 – y3
Variables:
x, y
CBSE
Class IX
Mathematics
Polynomials
Identity VIII
Formula Hardx3 + y3 + z3 – 3xyz = (x + y + z)(x2 + y2 + z2 – xy – yz – zx)]
Variables:
x, y, z
CBSE
Class IX
Mathematics
Polynomials
Euclid’s postulates
Formula Easy- Postulate 1 : A straight line may be drawn from any one point to any other point.
- Postulate 2 : A terminated line can be produced indefinitely.
- Postulate 3 : A circle can be drawn with any centre and any radius.
- Postulate 4 : All right angles are equal to one another.
CBSE
Class IX
Euclid’s Geometry
Mathematics
Angles Opposite Equal Sides
Theorem EasyStatement
Angles opposite to equal sides in a triangle are equal.
CBSE
Class IX
Mathematics
Triangles
Congruent Circles
Theorem EasyStatement
Two circles with equal radii are congruent.
CBSE
Class IX
Mathematics
Triangles
Congruent Squares
Theorem EasyStatement
Two squares with equal side lengths are congruent.
CBSE
Class IX
Mathematics
Triangles