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HKMO1314GCQ1
Figure 1 shows a [math]\Delta[/math]ABC . Construct a circle with centre O inside the triangle such
that the three sides of the triangle are tangents to the circle.
圖一所示為一個 [math]\Delta[/math]ABC 。試在該三角形內，構作一個圓心為 O 的圓，使三
角形三條邊均為該圓的切線。