CONSTRUCTION OF PARALLELOGRAM
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CONVERTING PREFIXES
Converting prefixes [ edit ] The SI allows easy multiplication when switching among units having the same base but different prefixes. To convert from metres to centimetres it is only necessary to multiply the number of metres by 100, since there are 100 centimetres in a metre. Inversely, to switch from centimetres to metres one multiplies the number of centimetres by 0.01 or divide centimetres by 100. Length [ edit ] A 2-metre carpenter's ruler See also: List of length, distance, or range measuring devices A ruler or rule is a tool used in, for example, geometry , technical drawing , engineering, and carpentry, to measure lengths or distances or to draw straight lines. Strictly speaking, the ruler is the instrument used to rule straight lines and the calibrated instrument used for determining length is called a measure , however common usage calls both instruments rulers and the special ...
TRIGONOMETRY RATIOS
Trigonometric ratios Main article: Trigonometric function In this right triangle: sin A = a / c ; cos A = b / c ; tan A = a / b . Trigonometric ratios are the ratios between edges of a right triangle. These ratios are given by the following trigonometric functions of the known angle A , where a , b and c refer to the lengths of the sides in the accompanying figure: Sine function (sin), defined as the ratio of the side opposite the angle to the hypotenuse . {\displaystyle \sin A={\frac {\textrm {opposite}}{\textrm {hypotenuse}}}={\frac {a}{c}}.} Cosine function (cos), defined as the ratio of the adjacent leg (the side of the triangle joining the angle to the right angle) to the hypotenuse. {\displaystyle \cos A={\frac {\textrm {adjacent}}{\textrm {hypotenuse}}}={\frac {b}{c}}.} Tangent functi...
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