2019年秋八年级数学上册第1章全等三角形1.3探索三角形全等的条件1.3.2尺规作图随堂检测(新版)苏科版.docx

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11.3.2 尺规作图1按 下列条件不能作出惟一三角形的是( )A已知两角夹边 B已知两边夹角C已知两边及一边的对角 D已知两角及其一角对边2已知线段 a、b 和 m,求作ABC,使 BC=a,AC= b,BC 上的 中线 AD=m,作法的合理顺序为( )延长 CD 到 B,使 BD=CD;连结 AB;作ADC,使 DC= a, AC=b,AD=mA B C D3 .已知线段 AB 和 BC,要作唯一的ABC,还需要给出一个 条件 。4.已知一条线段作等边 三角形, 令其边长等于已知线段的长,则作图的依据是。5.小明不小心在一个三角形上撒了一片墨水,请用尺规帮小明重新画一个 三角 形使它与原来的三角形完全相同.(保留作图痕迹,不写作法)2参考答案1. C2A3线段 AC(或 B)4 SSS5.解:如图,ABC 就是所求作的三角形.3

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