第7章平面直角坐标系下的三角形面积班别_________ 姓名_________【课前练习】1.若点A(1,0),B(4,0),则线AB=_____2.若点A(1,-3),B(1,2),则线AB=_____3.如图1,三角形ABC的面积是_______4.如图2,三角形ABC的面积是_______5.在下图中,过点A作出三角形ABC的高 6.在下图中,过点A作出三角形ABC的高【巩固练习】计算下列图形中,三角形ABC的面积1. = ×______=___ 2. = ×______=___3. = ×______=___ 4. = ×______=___答案1. = ×3×2=3 2. = ×3×2=33. = ×4×1=24. = ×3×2=6第7章平面直角坐标系下的三角形面积【小测1()】班别:_________ 姓名:__________计算下列图形中,三角形ABC的面积1. = ×______=___ 2. = ×______=___3. = ×______=___ 4. = ×______=___答案1. = ×4×3=62. = ×2×2=23. = ×3×1=1.54. = ×5×3=7.5第7章平面直角坐标系下的三角形面积【小测2()】班别:_________ 姓名:__________计算下列图形中,三角形ABC的面积1. = ×______=___2. = ×______=___3. = ×______=___4.若三角形ABC的三个顶点的坐标分别是A(-2,3),B(-2,10),C(2,5),则三角形ABC的面积是____答案:1. = ×3×2=3 2. = ×4×2=43. = ×4×6=124. = ×7×4=14 |