识别三角函数比值：快速形成性评估

GeoGebra 命令及参数

1. Random(5, 10) → d
2. Segment(B, A) → h
3. Semicircle(A, B) → c
4. Rotate(B, (Random[30, 150] * π / 180), Midpoint[A, B]) → B'_2
5. Segment(A, B'_2) → f
6. Random(30, 150) → a
7. Segment(B'_2, B) → g
8. Random(1, 6) → n
9. Element(L_1, n) → text1
10. Textfield(b) → InputBox1
11. Polygon(A, B'_2, B) → t1, b_1, a_1, b'_2
12. Angle(A, B'_2, B) → α
13. Angle(B'_2, B, A) → β
14. Angle(B, A, B'_2) → γ