section_heading: Steradijan
paragraph_text: \begin{align} \theta & = \arccos \left( \frac{r-h}{r} \right)\\ & = \arccos \left( 1 - \frac{h}{r} \right)\\ & = \arccos \left( 1 - \frac{1}{2\pi} \right) \approx 0,572 \,\text{rad} \mbox{ ili } 32,77^\circ \end{align} </math>