任意四边形面积公式推证的一种新方法

A new method of deducing the formula of the area of quadrilaterals

利用微积分原理给出任意四边形面积公式推证的一种新方法.此方法思路新颖、推证简洁,并将凹凸四边形面积公式推证统一其中,它是高等数学思想在初等数学领域中应用的又一范例.

According to the principles of infinitesimal calculus, a new method on how to ratiocinate the arbitrary quadrilaterals area was put forward. Because of its novel reason, compact deduction and the entia of the formulas of area of the concave and convex quadrilaterals, the way is another example to set the idea of advanced mathematics in the field of elementary study.