reference angle
One who performs the duties of a servant. / One who serves in an army; a soldier.
plural of Burgio
An acute angle with the same values of trigonometric functions, up to sign, as another angle: used for easy reference when examining the non-acute angle.
An instrument in the form of a dark chamber for observing the changes in the crystalline lens during accommodation.
210°の三角関数を求めるときは、まず同じ三角比（符号は場合によって異なる）を持つ鋭角、つまり参考角（30°）を求めてから符号を調整します。
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DiQt
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