Question

【ACM题】我想知道这道题的解决思路是什么。万分感谢！

我不会做这道题，所以打不出编程的程序。
不需要会写代码，只要告诉我数学上如何分析解决就行了。
请各位详细讲下这道题的解决办法，万分感谢！！

Turn the corner：

Mr. West bought a new car! So he is travelling around the city.
One day he comes to a vertical corner. The street he is currently in has a width x, the street he wants to turn to has a width y. The car has a length l and a width d.
Can Mr. West go across the corner?

Input

four real numbers, x, y, l and w.

Output

If he can go across the corner, print "yes". Print "no" otherwise.

Sample Input

10 6 13.5 4
10 6 14.5 4

Sample Output

yes
no

Answer 1

以车长为玄长，画四分之一圆，以此圆心为圆心，此圆半径减去车宽为半径再画四分之一圆。如果路拐角小圆之内，为yes，否则为no，如图：

Answer 2

这个题我记得微积分书上有例题的啊，设定一个角度吧，好像是，然后求正弦余弦什么的