An electrical grid is an interconnected network for delivering electricity from suppliers to consumers.

 An electrical grid

is an interconnected network for delivering electricity from suppliers to consumers.

It consists of generating stations that produce electrical power, high-voltage transmission lines that carry power from distant sources to demand centers, and distribution lines that connect individual customers.[1]

Power stations may be located near a fuel source, at a dam site, or to take advantage of renewable energy sources, and are often located away from heavily populated areas. They are usually quite large to take advantage of the economies of scale.

The electric power which is generated is stepped up to a higher voltage at which it connects to the electric power transmission network.

The bulk power transmission network will move the power long distances, sometimes across international boundaries, until it reaches its wholesale customer (usually the company that owns the local electric power distribution network).

On arrival at a substation, the power will be stepped down from a transmission level voltage to a distribution level voltage. As it exits the substation, it enters the distribution wiring.

Finally, upon arrival at the service location, the power is stepped down again from the distribution voltage to the required service voltage(s).

Sin Cos Tan Values In trigonometry, sin cos and tan values are the primary functions

 Sin Cos Tan Values

In trigonometry, sin cos and tan values are the primary functions we consider while solving trigonometric problems. These trigonometry values are used to measure the angles and sides of a right-angle triangle. Apart from sine, cosine and tangent values, the other three major values are cotangent, secant and cosecant.

When we find sin cos and tan values for a triangle, we usually consider these angles: 0°, 30°, 45°, 60° and 90°. It is easy to memorise the values for these certain angles. The trigonometric values are about the knowledge of standard angles for a given triangle as per the trigonometric ratios (sine, cosine, tangent, cotangent, secant and cosecant).

Sin Cos Tan Formula

The three ratios, i.e. sine, cosine and tangent have their individual formulas. Suppose, ABC is a right triangle, right-angled at B, as shown in the figure below:

sin cos tan values

Now as per sine, cosine and tangent formulas, we have here:

Sine θ = Opposite side/Hypotenuse = BC/AC

Cos θ = Adjacent side/Hypotenuse = AB/AC

Tan θ = Opposite side/Adjacent side = BC/AB

We can see clearly from the above formulas, that:

Tan θ = sin θ/cos θ

Now, the formulas for other trigonometry ratios are:

Cot θ = 1/tan θ = Adjacent side/ Side opposite = AB/BC

Sec θ = 1/Cos θ = Hypotenuse / Adjacent side = AC / AB

Cosec θ = 1/Sin θ = Hypotenuse / Side opposite = AC / BC

The other side of representation of trigonometric values formulas are:

Tan θ = sin θ/cos θ

Cot θ = cos θ/sin θ

Sin θ = tan θ/sec θ

Cos θ = sin θ/tan θ

Sec θ = tan θ/sin θ

Cosec θ = sec θ/tan θ

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Symmetry is when

 Symmetry is when one shape becomes exactly like another if you flip, slide or turn it.

The simplest type of Symmetry is “Reflection” (or “Mirror”) Symmetry,
the quality of being made up of exactly similar parts facing each other or around an axis.
“this series has a line of symmetry through its center”
synonyms:
regularity, evenness, uniformity, consistency, conformity, correspondence,equality;
correct or pleasing proportion of the parts of a thing.
“an overall symmetry making the poem pleasant to the ear”
1.
the correspondence in size, form, and arrangement of parts on opposite sides of a plane, line, or point; regularity of form or arrangement in terms of like, reciprocal, or corresponding parts.
2.
the proper or due proportion of the parts of a body or whole to one another with regard to size and form; excellence of proportion.
3.
beauty based on or characterized by such excellence o f proportion.
4.
Mathematics .
a.
a geometrical or other regularity that is possessed by a mathematical object and is characterized by the operations that leave the object invariant: A circle has rotational symmetry and reflection symmetry.
b.
a rotation or translation of a plane figure that leaves the figure unchanged although its position may be altered.
5.
Physics. a property of a physical system that is unaffected by certain mathematical transformations as, for example, the work done by gravity on an object, which is not affected by any change in the position from which the potential energy of the object is measured.

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