2019年中考数学专题复习第四单元三角形第23课时解直角三角形的应用课件.ppt

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UNIT FOUR,第四单元 三角形,第 23 课时 解直角三角形的应用,考点 解直角三角形的应用常用知识,考点聚焦,对点演练,题组一 教材题,题组二 易错题,【失分点】不善于根据实际问题构造直角三角形模型;对于非直角三角形,不能简洁地作出辅助线转化为直角三角形.,图23-4,图23-5,探究一 利用直角三角形解决和高度(或宽度) 有关的问题,【命题角度】 (1)求某建筑物或飞行器的高度(或宽度); (2)用列方程的方法求解含有两个特殊三角形的问题.,00000000000,图23-6,针对训练,00000000000,图23-9,探究二 利用直角三角形解决方向角问题,【命题角度】 (1)利用直角三角形解决方向角问题; (2)通过作辅助线把实际问题转化为直角三角形问题.,图23-10,针对训练,00000000000,图23-11,(2)若这名徒步爱好者以100米/分 的速度从雁峰公园返回宾馆,那么他在15分钟内能否到达宾馆?,00000000000,探究三 利用直角三角形解决坡度问题,【命题角度】 (1)利用直角三角形解决坡度问题; (2)通过作辅助线把涉及坡度的实际问题转化为直角三角形问题.,针对训练,图23-15,00000000000,

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