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6 questions
如圖
10
11
12
13
兩對角線互相垂直
兩對角線互相垂直且平分
兩對角線互相平分
兩對角線長度相等
32°
64°
73°
82°
∠A+∠B=180°
∠B=∠D
3
9
15
21
80°
75°
70°
65°
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