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Zuzana Benáková<br />

x<br />

B<br />

y<br />

z<br />

B<br />

B<br />

= u cosv cosα<br />

= u sinv cosα<br />

= u sinα<br />

sin α = konstanta<br />

cos α = konstanta<br />

(úhel α určuje daný kužel)<br />

u cosα v = u t<br />

t = v cosα<br />

Obrázek 2: rozvinutí kužele a jeho charakteristiky<br />

Transformační vzorce:<br />

ý´<br />

arctan<br />

x<br />

v =<br />

´<br />

cosα<br />

x =<br />

cos<br />

y =<br />

cos<br />

z =<br />

cos<br />

Podmínky jsou zřejmé.<br />

x′<br />

y′<br />

( arctan )<br />

x′<br />

x′<br />

y′<br />

( arctan )<br />

x′<br />

x′<br />

y′<br />

( arctan )<br />

x′<br />

sinα<br />

x′<br />

B<br />

= u cos ( v cosα)<br />

y′ = u sin ( v cosα)<br />

B<br />

x´<br />

u =<br />

cos(arctan<br />

y´<br />

x´<br />

y′<br />

⎛ arctan ⎞<br />

x′<br />

cos⎜<br />

⎟<br />

cosα<br />

cosα<br />

⎝ ⎠<br />

y′<br />

⎛ arctan ⎞<br />

x′<br />

sin⎜<br />

⎟<br />

cosα<br />

cosα<br />

⎝ ⎠<br />

)<br />

56

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