三角形的面积与高之间的关系

Relation Between the Area and the Heigh ts of a Triangle

利用已知三角形的三条高求作三角形的思想推导出了三角形的面积与三条高的关系式,托展了三角形面积的计算方法.

It is derive a relational expression between the ares and its three heights of a triangle based on the clue of making a triangle according to its three heights,and also expand the triangular area computing methods.