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1、第 1 页 共 5 页九年级数学直角三角形边角关系探究基础题北九年级数学直角三角形边角关系探究基础题北师版师版一、单选题一、单选题(共共 10 道，每道道，每道 10 分分)1.在 RtABC 中，若 AB=6，BC=2，则 cosA=( ).A. B. C. D. 2.如图，在 RtABC 中，tanB=，BC=，则 AC 等于（ ）A.3 B.4 C. D.6 3.6tan230sin602tan45A. B. C. D.以上均不正确 4.A. B. C.-1 D.以上均不正确 5.在ABC 中，A、B 为锐角，且有|sinA-|+=0，则这个三角形是（）第 2 页 共 5 页A.等腰三角
2、形 B.直角三角形 C.钝角三角形 D.等边三角形 6.已知 为锐角，且，则 的取值范围是（） A.3060 B.3060 C.3060 D.30 7.（2010 江苏苏州）如图，在菱形 ABCD 中，DEAB，cosA=，BE=2，则 tanDBE 的值（ ）A. B.2 C. D. 8.已知：如图，在ABC 中，CAB=120，AB=4，AC=2，ADBC，D 是垂足求 AD 的长A. B.2 C. D.以上答案均不正确 9.（2009 湖南衡阳）某人沿着有一定坡度的坡面前进了 10 米，此时他与水平地面的垂直距离为米，则这个坡面的坡度为 A. B. 第 3 页 共 5 页C.30 D.
3、10.如图，一艘轮船以每小时 20 海里的速度沿正北方向航行，在 A 处测得灯塔 C 在北偏西 30方向，轮船航行 2 小时后到达 B 处，在 B 处测得灯塔 C 在北偏西 60方向当轮船到达 灯塔 C 的正东方向的 D 处时，求此时轮船与灯塔 C 的距离 （结果保留根号）A. B.20 C. D.以上答案均不正确 内部资料，请勿外传！#XuyUP2kNXpRWXmA&UE9aQGn8xp$R#͑GxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8!z89AmYWpazadNu#KN&MuWFA5uxY7J
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