Plus Minus tentang Internet
Dampak negatif bermain GAME hampir sama dengan dampak permainan Play Station dimana seseorang yang sudah kecanduan akan betah seharian bermain dan bahkan lupa makan, lupa minum dan lupa kalau hari esok masih ada. Sedangkan effect bermain CHATTING mungkin bisa digambarkan dengan permainan INTERKOM yang marak sekitar 20 tahun yang lalu. Dimana hampir semua orang “lupa daratan” dan setiap hari kerjanya hanya bermain intercom (jika sudah memegang mic maka orang cenderung akan malas berangkat sekolah, malas berangkat kerja, malas membatu orang tua, malas untuk mengaji malas makan, malas minum dan sebagainya). Begitu juga dengan CHATTING.. para pelajar yang melakukan kegiatan ini menganggap waktu 5 jam sama dengan 10 menit. Dan mereka cenderung memanfaatkan CHATTING untuk sekedar ngobrol kesana-kemari dengan teman kencannya di internet dan bahkan tidak menutup kemungkinan juga mengarah kepada pembicaraan yang “jorok-jorok”. Effect permainan GAME & CHATTING ini justru lebih berbahaya dari kekhawatiran kita sekitar 5 tahun lalu tentang maraknya situs-situs porno.
Karena berdasarkan pengamatan, ternyata situs porno hanya berefek pada euforia dan dalam waktu singkat mereka sudah akan bosan. Namun effect GAME & CHATTING adalah “Effect Candu” yang bisa membuat penggunanya menjadi ketagihan dan ini yang sangat berbahaya bagi dunia pendidikan kita. Beberapa kejadian di Indonesia menunjukan ada kasus perkosaan oleh teman CHATTING, penipuan oleh teman CHATTING. Karena tidak menutup kemungkinan bahwa “teman baru” yang didapat di dunia maya itu pada akhirnnya dilanjutkan dengan “jumpa darat” dan bahkan ada juga yang langsung menjadi teman kencan. Aku juga prihatin bahwa para pelajar SLTP itu tanpa disadari menjadi korban dari para penjahat yang memanfaatkan sarana CHATTING untuk mencari mangsa. Hal tersebut bisa saja terjadi karena seorang yang terbiasa CHATTING bisa dengan mudah mengelabui lawan CHATTING nya. Misalnya seorang “PLAY BOY” berusia 35 tahun, bisa saja dengan mengaku berusia 17 tahun untuk menarik perhatian seorang pelajar SLTP yang berusia 15 tahun. Cukup dengan menguasai bahasa “gaul di internet” seorang Om-Om berusia 45 tahun bisa saja mengaku berusia 17 tahun. Bagi mereka yang penting bisa “akrab” dan bisa menyenangkan lawan CHATTING nya sambil mencari peluang dan mengatur strategi untuk bisa menjalankan aksi jahatnya.
source : http://dunia.pelajar-islam.or.id/dunia.pii/209/dampak-internet.html
Megan's Inside
Welcome to Official Megan's Website
Halaman
Friends
Written with a pen, sealed with a kiss,
If you are my friend, please answer me this:
Are we friends, or are we not?
You told me once, but i forgot.
So tell me now, and tell me true,
So i can say I’m here for you
Of all the friends I’ve ever met,
You're the one I won’t forget
And if I die before you do,
I'll go to heaven and wait for you,
I'll give the angels back their wings
and risk the loss of everything
There isn't a thing I wouldn’t do
To have a friend just like you.
Trigonometry (from Greek trigōnon "triangle" + metron "measure")[1] is a branch of mathematics that studies triangles, particularlyright triangles. Trigonometry deals with relationships between the sides and the angles of triangles and with the trigonometric functions, which describe those relationships, as well as describing angles in general and the motion of waves such as sound and light waves.
Pre-Hellenic societies such as the ancient Egyptians and Babylonians lacked the concept of an angle measure, but they studied the ratios of the sides of similar triangles and discovered some properties of these ratios. Ancient Greek mathematicians such asEuclid and Archimedes studied the properties of the chord of an angle and proved theorems that are equivalent to modern trigonometric formulae, although they presented them geometrically rather than algebraically. The sine function in its modern form was first defined in the Surya Siddhanta and its properties were further documented by the 5th century Indian mathematician and astronomer Aryabhata.[2] These Indian works were translated and expanded by medieval Islamic scholars. By the10th century Islamic mathematicians were using all six trigonometric functions, had tabulated their values, and were applying them to problems in spherical geometry. At about the same time, Chinese mathematicians developed trigonometry independently, although it was not a major field of study for them. Knowledge of trigonometric functions and methods reached Europe via Latin translations of the works of Persian and Arabic astronomers such as Al Battani and Nasir al-Din al-Tusi.[3] One of the earliest works on trigonometry by a European mathematician is De Triangulis by the 15th century German mathematician Regiomontanus. Trigonometry was still so little known in 16th century Europe that Nicolaus Copernicus devoted two chapters ofDe revolutionibus orbium coelestium to explaining its basic concepts.
The hypotenuse is the side opposite to the 90 degree angle in a right triangle; it is the longest side of the triangle, and one of the two sides adjacent to angle A. The adjacent leg is the other side that is adjacent to angle A. The opposite side is the side that is opposite to angle A. The terms perpendicular and base are sometimes used for the opposite and adjacent sides respectively. Many people find it easy to remember what sides of the right triangle are equal to sine, cosine, or tangent, by memorizing the word SOH-CAH-TOA (see below underMnemonics).
Calculating trigonometric functions
Trigonometric functions were among the earliest uses for mathematical tables. Such tables were incorporated into mathematics textbooks and students were taught to look up values and how to interpolate between the values listed to get higher accuracy. Slide rules had special scales for trigonometric functions.
Today scientific calculators have buttons for calculating the main trigonometric functions (sin, cos, tan and sometimes cis) and their inverses. Most allow a choice of angle measurement methods: degrees, radians and, sometimes, grad. Most computer programming languages provide function libraries that include the trigonometric functions. The floating point unit hardware incorporated into the microprocessor chips used in most personal computers have built-in instructions for calculating trigonometric functions.
Applications of trigonometry
There are an enormous number of uses of trigonometry and trigonometric functions. For instance, the technique of triangulation is used in astronomy to measure the distance to nearby stars, in geography to measure distances between landmarks, and in satellite navigation systems. The sine and cosine functions are fundamental to the theory of periodic functions such as those that describe sound and light waves.
Fields which make use of trigonometry or trigonometric functions include astronomy (especially, for locating the apparent positions of celestial objects, in which spherical trigonometry is essential) and hence navigation (on the oceans, in aircraft, and in space), music theory, acoustics, optics, analysis of financial markets, electronics, probability theory, statistics, biology,medical imaging (CAT scans and ultrasound), pharmacy, chemistry, number theory (and hence cryptology), seismology, meteorology, oceanography, many physical sciences, landsurveying and geodesy, architecture, phonetics, economics, electrical engineering, mechanical engineering, civil engineering, computer graphics, cartography, crystallography and game development.
Common formulae
The law of sines (also known as the "sine rule") for an arbitrary triangle states:
The Law of Cosines
The Law of Tangents
Blog Archive
About Me
- Yoga Fitrah Annurrahman
- Hai guys, let me introduce my self. My name is Yoga Fitrah Annurrahman, you can call me as Yoga. I love everything about science, animation, and so on. But, i hate liar, and everything that's sucks. So, i'm just ordinary person.
Followers
Wp Theme by Promiseringsdesigns | Blogger Template by Anshul