Measurements


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All trigonometrical computations require measurement of angles and computation of some trigonometrical function. The modern trigonometrical functions are sine, cosine, tangent, and their reciprocals .Trigonometry, of course, depends on geometry.Its a branch of Geometry with wider scope. Trigonometry developed from the study of right-angled triangles by applying their relations of sides and angles to the study of similar triangles. Computational trigonometry could only begin after the construction of a good trigonometric  table.

Trigonometric  works by defining different types of measurements that can be taken on a given angle within a triangle.  These measurements are:

	Measurement Measurement	Abbreviation
	sine	sin
	cosine	cos
	tangent	tan
	cosecant	csc
	secant	sec
	cotangent	cot

In order to define each of these types of measurements, we need to describe right triangles.  A right triangle is a triangle which has one 90-degree angle, two short sides called 'legs' and a long side called the 'hypotenuse'.

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