12. From an acute angled parallelogram to cut oila a given part by a line perpendicular to two of the sides (pl. 3, .fig. 65). 13. ... An inscribed angle is half the angle at the centre of the same are, and is therefore measured by the half of its are.
|Title||:||Iconographic Encyclopedia of Science, Literature, and Art|
|Publisher||:||Рипол Классик -|