角加法原理：形成性评估

GeoGebra 命令及参数

1. Sequence(i, i, -30, 30, 0.5) → l1
2. RandomElement(l1) → sol
3. Sequence(i, i, 10, 85, 1) → firstalist
4. RandomElement(firstalist) → firsta
5. Sequence(i, i, firsta + 5, 90, 1) → secondalist
6. RandomElement(secondalist) → seconda
7. Random(-30, 30) → a
8. Random(-30, 30) → c
9. Random(-30, 30) → f
10. Expand((a * x) + b) → h
11. Expand((c * x) + d) → p
12. Expand((f * x) + g) → q
13. Intersect(xAxis, yAxis) → B
14. Point(xAxis) → A
15. Rotate(A, (firsta * pi / 180), B) → D
16. Rotate(D, (seconda * pi / 180), B) → C
17. Ray(B, A) → k
18. Ray(B, D) → l
19. Ray(B, C) → m
20. Textfield(n) → InputBox1
21. Textfield(o) → InputBox3
22. Textfield(r) → InputBox4
23. If(n ≟ sol, "√", "X") → text5
24. If(o ≟ seconda, "√", "X") → text7
25. If(r ≟ biga, "√", "X") → text8
26. Textfield(s) → InputBox2
27. If(s ≟ firsta, "√", "X") → text6