relative ellipse area 相对椭圆面积
criterion of ellipse area 椭圆面积准则
area of an ellipse 椭圆的面积
ellipse contact area 椭圆接触面
So, you know, if you find that the area is too easy, you can integrate any function other than ellipse, if you prefer.
你们都知道，要求这个面积是非常简单的，如果你们想的话，可以积分除了椭圆函数以外的任何函数。
Let's say that we want to find the area of an ellipse with semi-axes a and b. OK, so that means an ellipse is just like a squished circle.
现在需要计算一个以a，b为半轴的椭圆的面积,其实椭圆就是一个被压扁的圆。
So, we know that we want to integrate just the area element, let's say, dx dy over the origin inside the ellipse.
我们知道现在要积分面积元素，那就对dxdy积分。
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