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Trigonometry

Trigonometry is a field of mathematics. It is the study of triangles. Trigonometry includes planar trigonometry, spherical trigonometry, finding unknown values in triangles, trigonometric functions, and trigonometric function graphs.

3,810 Questions

What is a seven sided figure called?

In geometry, a heptagon is a polygon with seven sides and seven angles.

How much concrete will i need to cover 65 square meters by 1 centimeter in depth?

65 square meters times 0.01 meters (one centimeter) equals 0.65 cubic meters.

If side a equals 76.4 ft and side b equals 39.3 ft what is the measure of angle A?

I will assume that this is a right triangle and neither side length is the hypotenuse.

In the case that this is a right triangle and neither side length given is for the hypotenuse, you would use tangent to solve for your angle measure.

tan(Q) = the length of the side opposite of Q/the length of the side adjacent to Q.

So for this answer:

**NOTE: Side a is traditionally the side opposite to angle A.**

tan(A) = a/b *where b is not the hypotenuse

=>

tan(A) = 76.4/39.3

tan(A) = 1.94402...

A = arctan(1.94402...) *arctan is the same thing as inverse tangent or tan^(-1)

A ~= 62.78 Degrees * ~= means approximately.

***Extra stuff:

tan = opposite/adjacent

sin = opposite/hypotenuse

cos = adjacent/hypotenuse

What is the value of sin 20 degrees?

The sine of 20° is approximately 0.342.

Why do cosine to the negative 1th power and cosine cancel out each other?

Cosine to the negative first power and cosine cancel each other out because cosine to the negative first power is one over cosine, and one over anything times anything is just one.

What are the qualification to susses in the bu-sines world?

One important qualification is to be able to communicate well and to do that you need to be able to spell correctly.

success.

business.

How can you prove that the line between to points is a tangent of the smaller circle?

Step I: Show that both points are outside the smaller circles. Possibly by showing that distance from each point to the centre of the circle is greater than its radius.

Step 2: Show that the line between the two points touches the circle at exactly one point. This would be by simultaneous solution of the equations of the line and the circle.

How do you convert surveyors elevations on the blueprints to feet?

1 meter is 3.28 feet. For instance, if your elevation is 60.38 meters, it means that it is 60.38 by 3.28 = 198.10 feet

How is sine calculated?

If you have an angle then the length of the side OPPOSITE that angle divided by the length of the HYPOTENUSE. (O/H)

(HYPOTENUSE is the side opposite the 90 degree angle)

or (y/x)

and a lot of other cool ways.

Can you integrate -cos x plus c?

Why not? Just a second integration. Drop the constant.

int[- cos(x)] dx

the negative implies - 1 and can be brought out side the integrand

- int[cos(x)] dx

= - sin(x) + C

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What is fourier analysis?

Fourier analysis began with trying to understand when it was possible to represent general functions by sums of simpler trigonometric functions.

The attempt to understand functions (or other objects) by breaking them into basic pieces that are easier to understand is one of the central themes in Fourier analysis.

Fourier analysis is named after Joseph Fourier who showed that representing a function by a trigonometric series greatly simplified the study of heat propagation.

If you want to find out more, look up fourier synthesis and the fourier transform.

What is a theodolite used for?

Surveying instrument of high precision, can measure both vertical and horizontal angles, unlike a level telescope which is limited to the flat angles. The name is believed to come from the Greek- meaning, The Eye of God.

Where does picnics come from?

[French pique-nique, probably reduplication of piquer, to pick]

There is no reliable etymology for the word picnic, with the original use of the word lagging about three hundred years behind the first descriptions of alfresco (open air) dining. From about 1340 until the very early 1800s, there are three contextual descriptions of picnics, whether or not the word is actually used: a pleasure party at which a meal was eaten outdoors; a hunt assembly; and an indoor social gathering or dinner party. An outdoor meal in a garden is described in Italian literature by Giovanni Boccaccio in a poem that dates from about 1340. Sixty years later a similar event occurs in one of Geoffrey Chaucer's Canterbury Tales. It seems certain that the assemblée, or meal served during the hunt that is described and illustrated in the hunt manual of Jacques du Fouilloux's La Vénerie (Hunting) (1560) and George Turberville's The Noble Arte of Venerie (1575), are picnics in all but name. By 1692, the concept of the alfresco meal shifted, and when cited in Gilles Ménage's Dictionnaire du Etymologique de la Langue Françoise (Etymological dictionary of the French language) piquenique is assumed to be of unknown origin, but means un repas où chacun paye son écot (a meal where each pays his share). By 1750, Ménage's editors suggest that piquenique may be of Spanish origin and that it appeared in 1664 in a French translation of works by Francisco Quevedo. Oliver Cromwell, Lord Protector of Great Britain, had a dinner served on the grounds of Hyde Park in 1654. Samuel Pepys, the English diarist, ate many meals while boating on the Thames or sitting on its banks. These are picnics in all but name, but they are only recorded as a dinner alfresco. The Oxford English Dictionary says that the word "picnic" originally referred to fashionable social entertainment in which each person contributed a share of the provisions, and says that the first recorded use of "picnic" in English appears in 1748 in a letter from Lord Chesterfield to his son, in the sense of an assembly or social gathering. It seems that the word was used in this sense widely in Germany, as Chesterfield's son was in Berlin at the time. A subsequent mention occurs in a letter from Lady M. Coke to Lady Stafford in 1763 from Hanover. Gustaf Palmfelt, a Swede, in a 1738 translation into Swedish used "picnick" (in the sense of an assembly); Swedish continues to use "picnick" and suggests that it is of French or English origin. Larousse Gastronomique (2002) states that 'picnic' is a contraction of pique (to pick), piquante (sharp or pungent), and nique (of small value). This suggestion seems commonsensical, but it is guesswork based on the technique of word formation by clipping words together to form a new word. In the arts and literature, picnics tend to be more concerned with place, action, and figurative meanings and less concerned with food, if it is mentioned at all. Oliver Goldsmith, whom Georgina Battiscombe (English Picnics, 1949) credits with describing the first picnic in English literature in The Vicar of Wakefield (1766) provides these bare bones: "Our family dined in the field, and we sat, or rather, reclined round a temperate repast, our cloth spread upon the hay." Battiscombe insists that a picnic must be a meal eaten outdoors to which diners bring something to eat, even if there is no sharing. She suggests that before the Romantics made nature fashionable "no one connected the idea of pleasure with the notion of a meal eaten anywhere but under a roof" (p. 4). In London, the so-called Picnic Society (1802) was a short-lived elite social club organized for entertainment. But a decade later "picnic" is used only in the sense of a meal eaten outdoors. Occasionally, it was used in the sense of an anthology, as in Charles Dickens's The Pic-Nic Papers, by Various Hands (1841), or as a term of disapprobation as in a person accused of picnickery and nicknackery, or being frivolous. Germans use picnick in the sense of holding a meeting, as in the phrase ein Picknick halten. The verb is picknicken, which literally means holding a picnic as you would hold a meeting or a party. Italians use scampagnata (holiday in the country), or lolazione sull'erba (luncheon on the grass). Spaniards use comida al aire libre (luncheon on the grass), or comida campestre (eat in the country). Spanish dictionaries seem unaware that Ménage thinks the word may be of Spanish origin. Koreans use both the Chinese so pong (a little meal in the country) and "picnic." Their favorite picnic time occurs when the cherry trees are in bloom. The Japanese have a long history of depicting meals taken outdoors, often celebrating hanami, the cherry blossom season, or another seasonal event. In 1862, "picnic" was translated as shokuji (meal), and in the twentieth century, the Japanese adopted the loanword pikunikku.

What is cosine 2 theta when sine theta equals .28?

If sine theta is 0.28, then theta is 16.26 degrees. Cosine 2 theta, then, is 0.8432