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matematyka
parallelogram, ray, acute-angled triangle, equilateral triangle, polygon, decrease/drop/fall, complementary angles, vertical, sphere, radius, parallel, sharply, wavy line, acute angle, octagon, alternate interior angles, infinity, circle, reflex/external, vertical angles, hypotenuse, gradually, diagonal, level off, plane, slightly, interval, vertex, cube, corresponding angles, semicircural, square