Question

Hii..Frnds Tell me Two formulas not related to class 5-10 of math.

Answer 1

Geometry formulas:  

Perimeter:

Perimeter of a square: s + s + s + s  

s:length of one side

Perimeter of a rectangle: l + w + l + w

l: length

w: width

Perimeter of a triangle: a + b + c

a, b, and c: lengths of the 3 sides

Area:

Area of a square: s × s  

s: length of one side

Area of a rectangle: l × w

l: length

w: width

Area of a triangle: (b × h)/2

b: length of base

h: length of height

Area of a trapezoid: (b1 + b2) × h/2

b1 and b2: parallel sides or the bases

h: length of height

volume:

Volume of a cube: s × s × s  

s: length of one side

Volume of a box: l × w × h

l: length

w: width

h: height

Volume of a sphere: (4/3) × pi × r3

pi: 3.14

r: radius of sphere

Volume of a triangular prism: area of triangle × Height = (1/2 base × height) × Height

base: length of the base of the triangle

height: height of the triangle

Height: height of the triangular prism

Volume of a cylinder:pi × r2 × Height

pi: 3.14

r: radius of the circle of the base

Height: height of the cylinder

Answer 2

There are some formulas related to trigonometry.

1. Sin2A

= Sin ( A+A)

SinA CosA + CosA SinA

$\boxed{Sin2A = 2SinA CosA }$

$Sin2A = \frac{2SinA CosA }{{Sin}^{2}A + { Cos }^{2} A}$

$***\boxed{Sin2A = \frac{ 2TanA}{ { Tan }^{2} A + 1 } }$

$\boxed{Sin^2A = \frac{ 1 - Cos^2A}{A } }$

$\boxed{** Sin3A = 3SinA - 4Sin3A}$

$\boxed{***Cos3A = 4Cos^A - 3CosA}$

$Tan3A = \frac{ 3TanA - Tan^2A }{1 - 3Tan^2A }$


Some formulas from Prism

Volume of a right Prism = (Area of its base) × height .


TSA ( Total surface area of Prism ) = ( lateral surface area ) + 2 (Area of the base).


Polygon

Perimeter of R - polygon = na.

Area of an octagon = 2 (√2 + 1) ( side)^2.


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