海龟1演示

海龟2演示

复位

你猜：哪只海龟走\ \quad\qquad\ 的路程最短？

文本

A: (0, 0)
B = (4.24782607371926, -0.023688082017807203)
C = (-0.08774595711165417, 1.2128108004213318)
c = Ellipse(A, B, C)
D = Point(c, 0.7)
α: atand(Slope[Segment[A, D]])
β: 180° - Angle[A, D, B]
E = Point(c, 0.6)
α1: atand(Slope[Segment[A, E]])
β1: 180° - Angle[A, E, B]
a = false
海龟1 = Turtle()
海龟2 = Turtle()

Tool: 简易坐标系
请选择原点，分别输入：x最小、最大值，y最小、最大值
Input: A, a, b, c, d
Output: B, C, O, u, v

$\huge\textcolor{}{x}$

$\huge\textcolor{}{y}$

$\Large\textcolor{}{O}$

A: (0, 0)
u = Vector(A + (a - 1, 0), A + (b + 1, 0))
v = Vector(A + (0, c - 1), A + (0, d + 1))
B: A + (b + 1, 0)
C: A + (0, d + 1)
O: A