Decimal Multiples And Submultiples of SI Units and Trigonometry

 Decimal multiples and submultiples of SI units

Multiple	Prefix	Symbol
1024	yotta	Y
1021	zetta	Z
1018	exa	E
1015	peta	P
1012	tera	T
109	giga	G
106	mega	M
103	kilo	k
102	hecto	h
101	deca	da

Submultiple	Prefix	Symbol
10-1	deci	d
10-2	centi	c
10-3	milli	m
10-6	micro	μ
10-9	nano	n
10-12	pico	p
10-15	femto	f
10-18	atto	a
10-21	zepto	z
10-24	yocto	y

What is Trigonometry?

- Trigonometry is one of the most important branches in mathematics that finds huge

   application in diverse fields.The branch called “Trigonometry” basically deals with the

   study of the relationship between the sides and angles of the right-angle triangle.

- In trigonometry, the angles can be either measured in degrees or radians.

- Some of the most commonly used trigonometric angles for calculations are 0°, 30°, 45°,

  60° and 90°. 

- Trigonometry is further classified into two sub-branches. The two different types of

   trigonometry are:

(1) Plane Trigonometry

(2) Spherical Trigonometry

Functions	Abbreviation	Relationship to sides of a right triangle
Sine Function	sin	Opposite side/ Hypotenuse
Tangent Function	tan	Opposite side / Adjacent side
Cosine Function	cos	Adjacent side / Hypotenuse
Cosecant Function	cosec	Hypotenuse / Opposite side
Secant Function	sec	Hypotenuse / Adjacent side
Cotangent Function	cot	Adjacent side / Opposite side

  Trigonometry Table :

Angles	0°	30°	45°	60°	90°
Sin θ	0	½	1/√2	√3/2	1
Cos θ	1	√3/2	1/√2	½	0
Tan θ	0	1/√3	1	√3	∞
Cosec θ	∞	2	√2	2/√3	1
Sec θ	1	2/√3	√2	2	∞
Cot θ	∞	√3	1	1/√3	0

 

- In the same way, we can find the trigonometric ratio values for

  angles beyond 90 degrees, such as 180°,270° and 360°.