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https://github.com/danbulant/notes
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vault backup: 2023-10-12 11:48:44
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@ -1,6 +1,7 @@
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# Geometrie
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%% Zoottelkeeper: Beginning of the autogenerated index file list %%
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- [[mat/Geometrie/Konstrukční úlohy|Konstrukční úlohy]]
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- [[mat/Geometrie/Kružnice|Kružnice]]
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- [[mat/Geometrie/Středová souměrnost|Středová souměrnost]]
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- [[mat/Geometrie/Zobrazení v rovině|Zobrazení v rovině]]
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%% Zoottelkeeper: End of the autogenerated index file list %%
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42
notes/mat/Geometrie/Kružnice.md
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42
notes/mat/Geometrie/Kružnice.md
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# Kružnice
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## Oblouk
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$k; k(S; ?)$
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$\stackrel{\smallfrown}{AB}; \stackrel{\smallfrown}{AB} \in k$
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$\sphericalangle ASB; \stackrel{\smallfrown}{AB} \in \sphericalangle ASB$
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středový úhel ($\sphericalangle ASB$) přísluší oblouku $\stackrel{\smallfrown}{AB}$ tak, aby v něm oblouk ležel.
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$V; V\in k; V\not\in\stackrel{\smallfrown}{AB}$
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$\sphericalangle AVB$
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Obvodový úhel ($\sphericalangle AVB$) je takový, že v něm $\stackrel{\smallfrown}{AB}$ leží.
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> [!SENTENCE]
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> Velikost středového úhlu příslušného $\stackrel{\smallfrown}{AB}$ je rovna dvojnásobku obvodového úhlu příslušného témuž oblouku.
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i.e. $|\sphericalangle AVB|=\frac{|\sphericalangle ASB|}2$
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### Tětivový čtyřúhelník
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Čtyřúhelník postaven z tětiv.
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Platí že $\alpha+\delta=180\degree=\gamma+\beta$
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$$\frac{\sin\alpha}{\sin60\cos\alpha-\cos60\sin\alpha}|/\sin\alpha$$
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$$\frac{1}{\sin60\frac{\cos\alpha}{\sin\alpha}-\cos60}$$
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$$\frac{1}{\sin60\cotg\alpha-\cos60}$$
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