![](https://static.elitesecurity.org/tex/24768ba025e55e9eed907d134bc82494.png)
Nadjes tacku
![](https://static.elitesecurity.org/tex/ee24d8509f045e2fa9191fa5c8bd7f57.png)
koja predstavlja projekciju tacke
![](https://static.elitesecurity.org/tex/ace327a3e8e417bfad6a8248c8d0a794.png)
na ravan
![](https://static.elitesecurity.org/tex/39e598bf197a90e58806da1c8f92c0e1.png)
. Tada vazi da je
![](https://static.elitesecurity.org/tex/e14d8d04699dac40571702fdda6abb5f.png)
(
![](https://static.elitesecurity.org/tex/22e5679bebd3930d0217cfba50fe1acc.png)
je srediste duzi
![](https://static.elitesecurity.org/tex/1dcbe90e6f7c03f5fbf137ce83f8335e.png)
).
Vektor normale ravni
![](https://static.elitesecurity.org/tex/39e598bf197a90e58806da1c8f92c0e1.png)
je
![](https://static.elitesecurity.org/tex/a4c8c38857751bf2ae51210b0fe7340b.png)
. Neka je
![](https://static.elitesecurity.org/tex/bd2b320696c94ea17dd122cd137b965c.png)
prava koja sadrzi tacke
![](https://static.elitesecurity.org/tex/ace327a3e8e417bfad6a8248c8d0a794.png)
i
![](https://static.elitesecurity.org/tex/22e5679bebd3930d0217cfba50fe1acc.png)
. Tada vazi
![](https://static.elitesecurity.org/tex/2a35fe3d7ede0cd714ba7c1131684cb7.png)
Jednacina normale koja prolazi kroz
![](https://static.elitesecurity.org/tex/ace327a3e8e417bfad6a8248c8d0a794.png)
je
![](https://static.elitesecurity.org/tex/94ccb6bed6bae9e6727301aca49066aa.png)
, tj.
![](https://static.elitesecurity.org/tex/4578e0d8147a6be62bb9162dbf44ccda.png)
. Kako
![](https://static.elitesecurity.org/tex/91f9af3b8980ca1dc51825e74c176985.png)
to vazi
![](https://static.elitesecurity.org/tex/f1aabe472e769e5af3ce9d90c408b3b4.png)
, a sa druge strane
![](https://static.elitesecurity.org/tex/da37ef2326953b19f5b7c2d98161c07d.png)
, pa vratis ovo u jednacinu ravni
![](https://static.elitesecurity.org/tex/39e598bf197a90e58806da1c8f92c0e1.png)
i nadjes
![](https://static.elitesecurity.org/tex/554531259df3762e60370f2583300848.png)
.
Kad nadjes
![](https://static.elitesecurity.org/tex/554531259df3762e60370f2583300848.png)
onda nadjes i tacku
![](https://static.elitesecurity.org/tex/22e5679bebd3930d0217cfba50fe1acc.png)
, a posle lako nadjes tacku
![](https://static.elitesecurity.org/tex/61c2bc68c49bcf4fb53b1b401a8ce7d7.png)
.
Nzm dal ti je tacno, nisam racunao.
Leonardo da Vinči
Nema istine u onim naukama u kojima se matematika ne primenjuje.
Milorad Stevanović
Bog postoji zato sto je matematika neprotivurečna.