Acute-angled+triangle
21History of algebra — Elementary algebra is the branch of mathematics that deals with solving for the operands of arithmetic equations. Modern or abstract algebra has its origins as an abstraction of elementary algebra. Historians know that the earliest mathematical… …
22Sine — For other uses, see Sine (disambiguation). Sine Basic features Parity odd Domain ( ∞,∞) Codomain [ 1,1] P …
23Parallel postulate — In geometry, the parallel postulate, also called Euclid s fifth postulate since it is the fifth postulate in Euclid s Elements , is a distinctive axiom in what is now called Euclidean geometry. It states that: If a line segment intersects two… …
24Pythagorean triple — A Pythagorean triple consists of three positive integers a , b , and c , such that a 2 + b 2 = c 2. Such a triple is commonly written ( a , b , c ), and a well known example is (3, 4, 5). If ( a , b , c ) is a Pythagorean triple, then so is ( ka …
25History of trigonometry — The history of trigonometry and of trigonometric functions may span about 4000 years.EtymologyOur modern word sine is derived from the Latin word sinus , which means bay or fold , from a mistranslation (via Arabic) of the Sanskrit word jiva ,… …
26Law of sines — The law of sines (sines law, sine formula, sine rule), in trigonometry, is a statement about any triangle in a plane. Where the sides of the triangle are a , b and c and the angles opposite those sides are A , B and C , then the law of sines… …
27Indian mathematics — mdash;which here is the mathematics that emerged in South Asia from ancient times until the end of the 18th century mdash;had its beginnings in the Bronze Age Indus Valley civilization (2600 1900 BCE) and the Iron Age Vedic culture (1500 500 BCE) …
28trigonometrical function — /trɪgənəˌmɛtrɪkəl ˈfʌŋkʃən/ (say triguhnuh.metrikuhl fungkshuhn) noun a function relating two sides of a right angled triangle with one of the acute angles in the triangle, as tangent, sine, cosine, cotangent, secant, cosecant, or any function… …
29Daniel Santbech — Detail from Santbech s Problematum astronomicorum et geometricorum Daniel Santbech (fl. 1561) was a Dutch mathematician and astronomer. He adopted the Latinized name of Noviomagus, possibly suggesting that he came from the town of Nijmegen,… …
30cosecant — [kəʊ si:k(ə)nt, sɛk ] noun Mathematics the ratio of the hypotenuse (in a right angled triangle) to the side opposite an acute angle; the reciprocal of sine. Origin C18: from mod. L. cosecant , from co + L. secant , secare to cut ; cf. secant …
