長度
餘弦
角度
\(a=\)
5
\(\frac{b^2+c^2-a^2}{2bc}=\)
0.7143
\(A=\)
44.4
\(^{\circ}\)
\(b=\)
6
\(\frac{c^2+a^2-b^2}{2ca}=\)
0.5429
\(B=\)
57.1
\(^{\circ}\)
\(c=\)
7
\(\frac{a^2+b^2-c^2}{2ab}=\)
0.2
\(C=\)
78.5
\(^{\circ}\)