Question

三角函数问题？

A triangle has two sides with lengths of 21 and 16. The measure of the angle opposite the side with a length of 16 is 35°. Find all possible measures of the angle opposite the side with a length of 21. 保留三位小数

Answer 1

一个三角形有2条边的长是21和16，已知16这条边所对的角是35°，求出21的边所得的角度的所有可能
此题有正弦定理可解
16/sin35°=21/sinx
sinx=21sin35°/16≈0.381
x≈22.396°

Answer 2

根据正弦定理列出等量关系，

再使用计算器计算。

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