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Пишет flaass (![[info]](http://lj.rossia.org/img/userinfo.gif){kind=small} flaass)@ 2003-02-21 16:01:00 |
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| Настроение: | otstreljamshis' |
Zadachka po stereometrii
Staraja zadachka, nevidannoj krasoty.
Na beloj ploskosti narisovan krasnyj krug diametrom metr, a poverx nego nakidany chernye polosy - summarnoj shirinoj men'she metra.
Dokazat', chto krasnoe progljadyvaet.
Podskazka: sm. subject:)
(Dlja pushhej strogosti: polosa eto kusok ploskosti mezhdu dvumja parallel'nymi prjamymi.
I krug, i polosy polagaem zamknutymi.)
