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某建设项目用地有六个界址点，其坐标依次为：J1(0，1)，J2(1，1)，J3(2，2)，J4(2，4)，J5(1，4)，J6(0，2)，则该项目的用地的总面积是( )。

A.3.5m2
B.4.7m2
C.4.5m2
D.5.7m2


【参考答案】

C
方法一为公式法，方法二为图形法。当点多的时候，建议先展点，后利用图形直接算面积。显然，该图形为一高2长处的矩......

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