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第十三章全等三角形测试卷填空题(每题3分满分30分)6.三角形ABC中∠A是∠B的2倍∠C比∠A∠B还大12度则这个三角形是__三角形.8.杜师傅在做完门框后为防止门框变形常常需钉两根斜拉的木条这样做的数学原理是____.9.△ABC中∠A∠B∠C∠A的平分线交BC于点D若CD8cm则点D到AB的距离为____cm.10.AD是△ABC的边BC上的中线AB12AC8则边BC的取值范围是___
12 全等三角形一、填空题(每小题3分,共27分)1.如果△ABC和△DEF全等,△DEF和△GHI全等,则△ABC和△GHI______全等, 如果△ABC和△DEF不全等,△DEF和△GHI全等,则△ABC和△GHI______全等.(填“一定”或“不一定”或“一定不”)2.如图1,△ABC≌△ADE,∠B=100°,∠BAC=30°,那么∠AED=______.3.△ABC中,∠BAC∶
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