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1、 第一章 解三角形 单元复习第一课时 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.知识结构正弦定理基本计算三角变换余弦定理面积公式解三角形实际应用Evaluation only.Eva
2、luation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.知识梳理1.正弦定理2.余弦定理Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5
3、Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.4.面积公式5.解三角形已知一边两角或两边与对角：正弦定理已知两边与夹角或三边：余弦定理 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Cr
4、eated with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.6.距离测量 一个不可到达点：测基线长和两个张角 两个不可到达点：测基线长和四个张角 7.高度测量在地面测仰角；在空中测俯角；在行 进中测方位角.8.角度测量测量行进方向；测量相对位置.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Cl
5、ient Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Pr
6、ofile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.例题分析 例1 在ABC中，已知AB=3，AC=4， BC= ，求三角形的面积.例2 在ABC中，已知 ， , D为BC的中点，且 BAD=30，求BC边的长.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5
7、 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.例3 在ABC中，已知A=2C，BC=AC1 ，AB=AC1，求三角形的三边长.AB=4，AC=5，BC=6.例4 在ABC中，已知sin2Asin2C sin2BsinAsinC，且 ， 求角A、B、C的值.B=60，C=45，A=75.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profi
8、le 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.例5 （2006年湖南卷）如图，D是直 角ABC斜边BC上一点，AB=AD，记 CAD=，ABC=. （）证明sin+cos2=0； （）若AC=DC，求的值.BDCA=60Evaluation only.Evaluation only. Created with Aspose.Slides for .NET
9、 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.作业：P19习题1.2A组：3，4，5.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Sl
10、ides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第一章 解三角形 单元复习第二课时 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright
11、2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.例1 在ABC中，已
12、知A=60，且 4sinBsinC=1，求角B、C的值.例题分析 B=105，C=15. 例2 在ABC中，已知 bc=2acos(60C)，求角A的值.A=120. Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 A
13、spose Pty Ltd.例3 在ABC中，已知ac=b2，求 cos(AC)cosBcos2B的值.3例4 在ABC中，已知ac=2b，求 的值.1 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose P
14、ty Ltd.例5 在ABC中，已知a=3，A=60， 求ABC的周长的最大值. 9例6 在ABC中，已知ABC的面积S= ，且存在实数使得ac=b，求的取值范围.(1,2Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011
15、 Aspose Pty Ltd.作业：P20习题1.2A组：12，13，14.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第一章 解三角形 单元复习第三课时 Evaluation on
16、ly.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Sli
