Problem Description

Math is important!! Many students failed in 2+2’s mathematical test, so let’s AC this problem to mourn for our lost youth..
Look this sample picture:
A ellipses in the plane and center in point O. the L,R lines will be vertical through the X-axis. The problem is calculating the blue intersection area. But calculating the intersection area is dull, so I have turn to you, a talent of programmer. Your task is tell me the result of calculations.(defined PI=3.14159265 , The area of an ellipse A=PI*a*b )

实际上提示没有什么卵用

大意就是求椭圆被x=L,x=R所切成的面积

那么化简一下椭圆方程,写成f(x)=sqrt(b^2-b^2*x^2/a^2)

然后直接套板子就行了

 


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