正弦定理：几何意义与作图方法

GeoGebra 命令及参数

1. Segment(A, B) → c
2. Segment(A, C) → b
3. Segment(C, B) → a
4. Angle(B, A, C) → α
5. Angle(C, B, A) → β
6. Angle(A, C, B) → γ
7. TableText({{"\textcolor{0000ff}{\frac{a}{sin A}}", "=", "\textcolor{0000ff}{\frac{" + a + "}{sin(" + α + ")}}"}, {"", "=", "\textcolor{0000ff}{" + (a / sin(α)) + "}"}}) → text1
8. TableText({{"\textcolor{ff0000}{\frac{b}{sin B}}", "=", "\textcolor{ff0000}{\frac{" + b + "}{sin(" + β + ")}}"}, {"", "=", "\textcolor{ff0000}{" + (b / sin(β)) + "}"}}) → text3
9. TableText({{"\textcolor{990099}{\frac{c}{sin C}}", "=", "\textcolor{990099}{\frac{" + c + "}{sin(" + γ + ")}}"}, {"", "=", "\textcolor{990099}{" + (c / sin(γ)) + "}"}}) → text4