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【答案】 C Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二、填空题 6．(2011年高考上海卷)在相距2千米的A，B两点处测量目标C，若∠CAB＝75°， ∠CBA＝60°，则A，C两点之间的距离是________千米． Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 10．【创新预测题】如图，扇形AOB，圆心角AOB等于60°，半径为2，在弧 AB上有一动点P，过P引平行于OB的直线和OA交于点C，设∠AOP＝θ， 求△POC面积的最大值及此时θ的值． Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. * 第八节 正弦定理和余弦定理应用举例 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 1．解斜三角形的四种常见类型及解法 已知条件 应用定理 一般解法 一边和两角 (如a，B，C) 正弦定理 由A＋B＋C＝180°，求角A；由 正弦定理求出b与c. 在有解时只有一解 两边和夹角 如(a，b，C) 余弦定理 正弦定理 由余弦定理求第三边c；由正弦定理求出小边所对的角；再由A＋B＋C＝180°，求出另一角． 在有解时只有一解 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.
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