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先做一角A使∠A=α在∠A兩個邊上任意一個邊上,以A為頂點截一點C使AC = b再以C為定點做一弧r=a交∠A的另一邊交點為B連接C、B兩點 其實說有也可以,就是做的先後順序的不同而已.這個題也可先做線,也可先做角,沒有什麼本質的區別.
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