2.特殊角的锐角三角比比值
    <img src="https://pica.zhimg.com/50/v2-193728fce4b65e27913b7f39d6966cbc_720w.jpg?source=1940ef5c" data-rawwidth="1200" data-rawheight="840" data-size="small" data-caption="" class="origin_image zh-lightbox-thumb" width="1200" data-original="https://pic1.zhimg.com/v2-193728fce4b65e27913b7f39d6966cbc_r.jpg?source=1940ef5c"/>
    

    3.仰角和俯角
    在进行测量时，从下往上看，视线与水平线的夹角叫做仰角; 从上往下看，视线与水平线的夹角叫做俯角。
    <img src="https://pic1.zhimg.com/50/v2-a16fd6885a6d5fc1298f1faa33ea439b_720w.jpg?source=1940ef5c" data-rawwidth="1184" data-rawheight="800" data-size="small" data-caption="" class="origin_image zh-lightbox-thumb" width="1184" data-original="https://pic2.zhimg.com/v2-a16fd6885a6d5fc1298f1faa33ea439b_r.jpg?source=1940ef5c"/>
    

    4.坡度比
    建筑学中把斜坡起止点A，B的高度差h与它们水平距离l的比叫做坡度(或坡比)，通常用字母 ii 来表示，即 ：i=h：li=h：l 。如图，斜坡 ABAB 与水平线 ACAC 的夹角记作 α\alpha ，那么 i=hl=tanαi=\frac{h}{l}=tan\alpha (坡度等于锐角 α\alpha 的正切)。
    <img src="https://pic2.zhimg.com/50/v2-f581508849e9882d2d548d775d03c0ba_720w.jpg?source=1940ef5c" data-rawwidth="1224" data-rawheight="920" data-size="small" data-caption="" class="origin_image zh-lightbox-thumb" width="1224" data-original="https://pic2.zhimg.com/v2-f581508849e9882d2d548d775d03c0ba_r.jpg?source=1940ef5c"/>
    

    5.方位角
    <img src="https://pic2.zhimg.com/50/v2-e4890e6d44c08bfc2dc194557cff2b94_720w.jpg?source=1940ef5c" data-rawwidth="1168" data-rawheight="720" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="1168" data-original="https://picx1.zhimg.com/v2-e4890e6d44c08bfc2dc194557cff2b94_r.jpg?source=1940ef5c"/>
    

    二、解直角三角形2种思路
    <img src="https://picx1.zhimg.com/50/v2-984265e5f69605eb306627eebf6c659e_720w.jpg?source=1940ef5c" data-rawwidth="1378" data-rawheight="955" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="1378" data-original="https://picx1.zhimg.com/v2-984265e5f69605eb306627eebf6c659e_r.jpg?source=1940ef5c"/>
    

    三、解直角三角形的6个模型
    模型一
    <img src="https://picx1.zhimg.com/50/v2-51314ab037298cd00ee925afedd688bc_720w.jpg?source=1940ef5c" data-rawwidth="1170" data-rawheight="266" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="1170" data-original="https://picx1.zhimg.com/v2-51314ab037298cd00ee925afedd688bc_r.jpg?source=1940ef5c"/>
    

    模型二
    <img src="https://pic1.zhimg.com/50/v2-b47b59d1754040ae1dc53dbb2e0b1a30_720w.jpg?source=1940ef5c" data-rawwidth="1045" data-rawheight="238" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="1045" data-original="https://pic2.zhimg.com/v2-b47b59d1754040ae1dc53dbb2e0b1a30_r.jpg?source=1940ef5c"/>
    

    模型三
    <img src="https://pic1.zhimg.com/50/v2-aa1200edd4b2e50bc1790fdb7a6af73f_720w.jpg?source=1940ef5c" data-rawwidth="1042" data-rawheight="294" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="1042" data-original="https://pic2.zhimg.com/v2-aa1200edd4b2e50bc1790fdb7a6af73f_r.jpg?source=1940ef5c"/>
    

    模型四
    <img src="https://pica.zhimg.com/50/v2-9dcbf36164fa316d2ab09d2eb1b617d7_720w.jpg?source=1940ef5c" data-rawwidth="1141" data-rawheight="251" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="1141" data-original="https://pic1.zhimg.com/v2-9dcbf36164fa316d2ab09d2eb1b617d7_r.jpg?source=1940ef5c"/>
    

    模型五
    <img src="https://pica.zhimg.com/50/v2-7ed2c42368038c7806753783439164fd_720w.jpg?source=1940ef5c" data-rawwidth="1027" data-rawheight="237" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="1027" data-original="https://pic1.zhimg.com/v2-7ed2c42368038c7806753783439164fd_r.jpg?source=1940ef5c"/>
    

    模型六
    <img src="https://pic1.zhimg.com/50/v2-480ce5d73704de72a3a1da231d4d2706_720w.jpg?source=1940ef5c" data-rawwidth="1041" data-rawheight="260" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="1041" data-original="https://pic2.zhimg.com/v2-480ce5d73704de72a3a1da231d4d2706_r.jpg?source=1940ef5c"/>
    

    四、小试牛刀
    <img src="https://pica.zhimg.com/50/v2-1197cb81c533b61a0e3ba30ab55fe141_720w.jpg?source=1940ef5c" data-rawwidth="956" data-rawheight="425" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="956" data-original="https://pic1.zhimg.com/v2-1197cb81c533b61a0e3ba30ab55fe141_r.jpg?source=1940ef5c"/>
    

    <img src="https://pic2.zhimg.com/50/v2-12d8243bdd6aa4ad85feb9e6a22d69be_720w.jpg?source=1940ef5c" data-rawwidth="968" data-rawheight="548" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="968" data-original="https://pica.zhimg.com/v2-12d8243bdd6aa4ad85feb9e6a22d69be_r.jpg?source=1940ef5c"/>
    

    <img src="https://pic3.zhimg.com/50/v2-1f141027a2b5386e51a7c4304a20c991_720w.jpg?source=1940ef5c" data-rawwidth="963" data-rawheight="638" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="963" data-original="https://pic2.zhimg.com/v2-1f141027a2b5386e51a7c4304a20c991_r.jpg?source=1940ef5c"/>
    

    <img src="https://pic2.zhimg.com/50/v2-31eb16bf3b447a7c796f7eb0229d4d58_720w.jpg?source=1940ef5c" data-rawwidth="923" data-rawheight="578" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="923" data-original="https://pica.zhimg.com/v2-31eb16bf3b447a7c796f7eb0229d4d58_r.jpg?source=1940ef5c"/>
    

    <img src="https://pic1.zhimg.com/50/v2-6386dd1cf3c53063bee2cab3b112ac6e_720w.jpg?source=1940ef5c" data-rawwidth="956" data-rawheight="619" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="956" data-original="https://pic1.zhimg.com/v2-6386dd1cf3c53063bee2cab3b112ac6e_r.jpg?source=1940ef5c"/>
    

    <img src="https://pic1.zhimg.com/50/v2-937f9b899a287813a3e46c4348a10fcb_720w.jpg?source=1940ef5c" data-rawwidth="938" data-rawheight="364" data-size="normal" data-caption="" class="origin_image zh-lightbox-thumb" width="938" data-original="https://pica.zhimg.com/v2-937f9b899a287813a3e46c4348a10fcb_r.jpg?source=1940ef5c"/>
    

     (责任编辑：admin)