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Scale of chords : ウィキペディア英語版 | Scale of chords A scale of chords may be used to set or read an angle in the absence of a protractor. To draw an angle, compasses describe an arc from origin with a radius taken from the 60 mark. The required angle is copied from the scale by the compasses, and an arc of this radius drawm from the sixty mark so it bisects the first arc. The line drawn from this point to the origin will be at the target angle. ==Mathematics== A chord is a line drawn between two points on the circumference of a circle. Look at the centre point of this line. For a circle of radius , each half will be so the chord will be . The line of chords scale represents each of these values linearly on a scale running from 0 to 60.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Scale of chords」の詳細全文を読む
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