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If 0° ≤ A ≤ 180°, find ∠A, to the nearest tenth of a degree.

If 0° ≤ A ≤ 180°, find ∠A, to the nearest tenth of a degree.-example-1
User Ykok
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Answer:

a) A = 140.6 degrees

b) A = 16.6 degrees

c) C = 122.9 degrees

d) C = 64.6 degrees

Step-by-step explanation:
\begin{gathered} \cos A=-0.7732 \\ \\ A=\cos^(-1)(-0.7732)=140.6^o \end{gathered}
\begin{gathered} \sin A=0.2853 \\ \\ A=\sin^(-1)(0.2853)=16.6^o \end{gathered}


\begin{gathered} \tan C=-1.5477 \\ \\ C=\tan^(-1)(-1.5477)=180-57.1327=122.9^o \end{gathered}


\begin{gathered} \cos C=0.4288 \\ \\ C=\cos^(-1)(0.4288)=64.6^o \end{gathered}

User Ssgao
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