Give a definition about area vector of a polygon on the plane and its formula, area formula of a polygon can be sought by it.
给出平面上多边形的面积矢量的定义及公式，并应用它求出多边形的面积公式。
Based on the definition of the confidence interval, we obtained the combination confidence region of the Lognormal population and the area formula of the combination confidence region.
从置信区间本质意义出发，得到了对数正态总体参数的联合置信域以及置信域的面积公式。
Based on both the area formula of gear tooth and groove and their respective center multiplying formula, the force and moment expressions of both sides of side-panels could be brought out at first.
由推导出的齿端和槽端面积及其圆心矩公式，首先得出轴套（侧板）内外两侧所受的力和力矩关于齿轮基本参数的函数表达式。
Based on both the area formula of gear tooth and groove and their respective center multiplying formula, the force and moment expressions of both sides of side-panels could be brought out at first.
由推导出的齿端和槽端面积及其圆心矩公式，首先得出轴套（侧板）内外两侧所受的力和力矩关于齿轮基本参数的函数表达式。
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