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Discussion of Problem 2099. Space Invader

Wa #13
Posted by liudy 13 Aug 2016 08:45
Can someone tell me what the test#13 example please?
Re: Wa #13
Posted by Mahilewets 3 Jun 2017 17:53
Something like AB and CD are orthogonal and complanar and there is no right such point E,  that E lies on AB-line,  E lies on CD line and the angle AED is ninety degrees.