Concept — Coefficiente angolare. Featured in chapters 18 · 20 · 28 · 42 Linked atoms 7 linked atoms. 18 Fasci di rette Proper and improper pencils compared The improper pencil The proper pencil 20 Circonferenza nel piano cartesiano Tangent at a point of the circle 28 Circonferenza goniometrica e funzioni sin, cos, tan arctan and the gradient Worked examples of the inverses 42 Derivate The derivative as the slope of the tangent