湖北省武汉市八年级数学下册第十七章勾股定理17.1勾股定理限时练(无答案)(新版)新人教版.doc

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117.1 勾股定理班级: 姓名: 小组: 分数: 卷面: A 卷 基础过关题(30 分)1、 (6 分)在 RtABC,B=90,a=3,b=4,则 c= 。2、 (6 分)如图,等腰 中, , 是底边上的高,若 ,ABC AD5cm6cABC,则 cmDACDB3、 (6 分)在 RtABC,C=90,a=8,b=15,则 c= 。4、 (12 分)在 RtABC,C=90则:(1)已知 c=17,b=8, 求 a(2)已知 a :b=3 :4, c=25, 求 b (3)已知 b=15,A=30,求 a,cB 卷 拓展提升题(15 分)5、已知直角三角形的两边长分别为 3cm 和 5cm, ,则第三边长为 。6、议直角三角形的斜边比一条直角边长多 2,另一条直角边长为 6,则斜边的长是( )A 4 B 8 C 10 D 127、直角三角形的两条直角边的长分别是 5 和 12,则其斜边上的高的长是( )A 6 B 8 C D 13062C 卷 能力挑战题(15 分)8.已知,如图,折叠长方形(四个角都是直角,对边相等)的议边 AD 使点 D 落在 BC 边的点 F 处,已知 AB=8,BC=10,求 CF,CE 的长

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