Answers
Answers
tanθ＝634/3000＝317/1500≒0.21133･･･
三角比の表でtanθの値が、0.21133･･･に近い値を探すと
tan(11°)≒0.1944→0.21133－0.1944＝0.01693
tan(12°)≒0.2126→0.2126－0.21133＝0.00127
●約12°
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補足
arctan(317/1500)≒11.93292714291234282250475383766･･･
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