The Guinness Encyclopedia/The Guinness Encyclopedia - Wayzata Technology (3221-1B) (Disc 1) (1995).iso/mac/nature/16in_nat.ure/card_42471.xml

Extensible Markup Language | 1995-08-15 | 2KB | 29 lines

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        <text><span class="style10">athematics and its Applications (3 of 4)</span><span class="style7">These ratios are given names. For example, the sine of an angle is the ratio of the side opposite the given angle to the hypotenuse. The Greek letters  (</span><span class="style26">theta</span><span class="style7">) and   (</span><span class="style26">phi</span><span class="style7">) are usually used to denote the angles; thus in the triangle shown we say that the sine of , usually written sin , is BC/AC. Similarly, since the </span><span class="style26">cosine</span><span class="style7"> (cos) of the angle is the ratio of the side adjacent to the given angle to the hypotenuse, cos  is AB/AC. The third basic ratio is the </span><span class="style26">tangent</span><span class="style7"> (tan), which is the ratio of the opposite to the adjacent side, BC/AB in the example; it is easy to see that tan  must always equal sin  / cos . Pythagoras' theorem can be used to establish some very useful values for sin, cos and tan.</span></text>
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    <content>
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        <text>ΓÇó ASTRONOMYΓÇó PHYSICSΓÇó CHEMISTRYΓÇó THE HISTORY OF SCIENCE</text>
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        <text>4204060</text>
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    <name>p062-3</name>
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