解直角三角形的應用ppt課件
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,解直角三角形的應用,坡度、坡角和方位角,超市里有兩個自動扶梯,你認為哪一個比較陡?,,如何用數(shù)學方法描述一個坡度呢?請你自學書上127頁,標記出“坡腳”、“坡度”的意義。,公式: 坡度??= ?? ??,α,坡面的鉛垂高度(h)和水平寬度(l)的比叫做坡面的坡度(或坡比)。,,坡面與水平面所夾的銳角叫做坡角。,,坡比越大,山坡越陡,,用數(shù)學去解釋生活,如圖,正切也經(jīng)常用來描述山坡的坡度.例如,有一山坡在水平方向上每前進100m就升高60m,那么山坡的坡度i(即tanα)就是:,你會算嗎?,1、坡角α=45°坡比i=,1∶1,30°,現(xiàn)在,你會通過計算坡度來解釋哪個扶梯更陡嗎?,解:甲梯中,,乙梯中,,∵tanβtanα,∴乙梯更陡.,在生活中,常用一個銳角的正切表示梯子的傾斜程度.,,小試牛刀,,我軍某部在一次野外訓練中,有一輛坦克準備通過一座小山,已知山腳和山頂?shù)乃骄嚯x為1000米,山高為565米,如果這輛坦克能夠爬300 的斜坡,試問:它能不能通過這座小山?,如圖,攔水壩的橫斷面為梯形ABCD(圖中i=1:3是指坡面的鉛直高度DE與水平寬度CE的比),根據(jù)圖中數(shù)據(jù)求: (1)坡角a和β; (2)壩頂寬AD和斜坡AB的長(精確到0.1m),解:(1)在Rt△AFB中,∠AFB=90°,在Rt△CDE中,∠CED=90°,,方位角,第二部分,,如圖:點A在O的北偏東30° 點B在點O的南偏西45°(西南方向),方位角→,指南或指北的方向線與目標方向線構成小于900的角,叫做方位角.,,口訣“上北下南左西右東”,,你知道怎么描述圖中的方位嗎?,如圖,一艘輪船位于燈塔P的北偏東60°方向,距離燈塔80海里的A處,它沿正南方向航行一段時間后,到達位于燈塔P的南偏東30°方向上的B處,這時,海輪所在的B處距離燈塔P有多遠? (精確到0.01海里),,,,,,P,B,C,A,M,N,80,,,海中有一個小島A,它的周圍8海里范圍內(nèi)有暗礁,漁船跟蹤魚群由西向東航行,在B點測得小島A在北偏東60°方向上,航行12海里到達C點,這時測得小島A在北偏東30°方向上,如果漁船不改變航線繼續(xù)向東航行,有沒有觸礁的危險?,,,,,B,A,C,,D,,,12,,,,,M,分析:繼續(xù)航行是否安全,取決于小島A到BC航線的距離是否大于8海里。,CONTENTS,,單擊此處添加標題,Click here to add words,01,,,單擊此處添加標題,Click here to add words,02,,,單擊此處添加標題,Click here to add words,03,,,單擊此處添加標題,Click here to add words,04,,單擊此處添加標題,Click here to add words,,,,,,,,,,,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,單擊此處添加標題,Click here to add words,,,,,,,,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,單擊此處添加標題,Click here to add words,,,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,單擊此處添加標題,Click here to add words,添加標題,Click here to add words,,Click here to add words,,Click here to add words,,Click here to add words,,單擊此處添加標題,Click here to add words,01,02,03,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,單擊此處添加標題,Click here to add words,添加標題,Click here to add words,,Click here to add words,,Click here to add words,,Click here to add words,,單擊此處添加標題,Click here to add words,,,,,,,添加標題,84%,,,添加標題,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,單擊此處添加標題,Click here to add words,,,,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,,第三部分,Click here to add words,201X,,單擊此處添加標題,Click here to add words,,,,,點擊此處添加標題,點擊此處添加標題,點擊此處添加標題,點擊此處添加標題,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,單擊此處添加標題,Click here to add words,,S,,O,,W,,T,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,單擊此處添加標題,Click here to add words,,,,,,,,,,,,點擊此處添加標題,點擊此處添加標題,點擊此處添加標題,點擊此處添加標題,添加標題,Click here to add words,添加標題,Click here to add words,添加標題,Click here to add words,添加標題,Click here to add words,單擊此處添加標題,Click here to add words,添加標題,Click here to add words,,Click here to add words,,Click here to add words,,Click here to add words,,,第四部分,Click here to add words,201X,,單擊此處添加標題,Click here to add words,,,,,,,01,02,03,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,單擊此處添加標題,Click here to add words,,,,,添加標題,Click here to add words,添加標題,Click here to add words,添加標題,Click here to add words,添加標題,Click here to add words,單擊此處添加標題,Click here to add words,,,,,,,,,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,添加標題,Click here to add words,Click here to add words,PPT模板下載: 行業(yè)PPT模板: 節(jié)日PPT模板: PPT素材下載: PPT背景圖片: PPT圖表下載: 優(yōu)秀PPT下載: PPT教程: Word教程: Excel教程: 資料下載: PPT課件下載: 范文下載: 試卷下載: 教案下載: 字體下載:,單擊此處添加標題,Click here to add words,,添加標題,Click here to add words,,Click here to add words,,Click here to add words,,Click here to add words,,,謝謝聆聽,點擊添加您的副標題,201X,,答辯人:第一PPT,,可以在下列情況使用 不限次數(shù)的用于您個人/公司、企業(yè)的商業(yè)演示。 拷貝模板中的內(nèi)容用于其它幻燈片母版中使用。,不可以在以下情況使用 用于任何形式的在線付費下載。 收集整理我們發(fā)布的免費資源后,刻錄光碟銷售。,PPT模板下載: 行業(yè)PPT模板: 節(jié)日PPT模板: PPT素材下載: PPT背景圖片: PPT圖表下載: 優(yōu)秀PPT下載: PPT教程: Word教程: Excel教程: 資料下載: PPT課件下載: 范文下載: 試卷下載: 教案下載: 字體下載: ,34,- 配套講稿:
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