四边形内角和演示

GeoGebra 命令及参数

1. Segment(C, B) → b
2. Segment(B, A) → c
3. Angle(A, B, C) → angleB
4. Segment(A, D) → a
5. Segment(D, C) → d
6. Angle(D, A, B) → angleA
7. Angle(C, D, A) → angleD
8. Angle(B, C, D) → angleC
9. TableText({{"\fgcolor{0000ff}{∠A} + \fgcolor{00cc00}{∠B} + \fgcolor{ff0000}{∠C} + \fgcolor{cc00cc}{∠D}", "=", "\fgcolor{0000ff}{" + angleA + "} + \fgcolor{00cc00}{" + angleB + "} + \fgcolor{ff0000}{" + angleC + "} + \fgcolor{cc00cc}{" + angleD + "}"}, {"", "=", angleA + angleB + angleC + angleD}}) → text1