There are 8,000 books in a library. There are 5,920 non-fiction books. What percent of the books are non–fiction books?
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let's recall that corresponding angles are equal, thus 105° twins, also let's recall that a flat-line has 180°.
since the two sides stemming from Ɣ are twins, the angles they make at the base are also twins, bearing in mind that a triangle has a sum of all interior angles of 180°.
