向量的大小与方向

GeoGebra 命令及参数

1. Intersect(eq2, g) → E
2. Vector(A, B) → u
3. Intersect(f, eq1) → C
4. Dilate(E, If[2 < a ≤ 3, 3 - a, 0], B) → C'
5. Dilate(A, If[1 < a ≤ 2, 2 - a, 0], E) → A'
6. Vector(A, A') → v
7. Midpoint(A, B) → D
8. Vector(E, C') → w
9. If(y(E) < y(A), "south", y(E) > y(A), "north") → text10
10. If(x(B) < x(A), "west", x(B) > x(A), "east") → text12
11. Angle(B, E, A) → α