梁子湖期末如图,在平面直角坐标系知识点中A(2.-1)B(4.3)C(1.2)求三角形ABC的面积

来源：蜘蛛抓取(WebSpider) 时间：2015-04-02 11:44 标签： 平面直角坐标系
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/etc/nginx/nginx.conf.如图在平面直角坐标系中,三角形三个顶点坐标为A（-5,4）,B（-1,5）,C（-2,1）求三角形ABC面积
用两点式求出AB直线方程为：x-4y+21=0,再用点到直线距离公式求出C到AB的距离为15√17/17,用两点距离公式求出AB=√17,所以S△ABC=1/2*15√17/17*√17=15/2
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扫描下载二维码如图 在平面直角坐标系中,A(0,1)B(2,0)c(4,3) (1)求三角形ABC的面积 (2)设点P在坐标轴上,且如图 在平面直角坐标系中,A（0,1）B（2,0）c（4,3）　　（1）求三角形ABC的面积　　（2）设点P在坐标轴上,且三角形abp与三角形ABC的面积相等,求点p的坐标
面积=4*3-1*2/2-2*3/2-2*4/2=4p（10,0）、（-6,0）、（0,-3）、（0,5）
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