| 31. | In the case of two of the circles being of equal size, the two external tangent lines are parallel.
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| 32. | Extrapolation means creating a tangent line at the end of the known data and extending it beyond that limit.
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| 33. | The tangent line of an orthogonal trajectory is perpendicular to the tangent line of the circle, and vice versa.
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| 34. | If " k " is known, the equation of the tangent line can be found in the point-slope form:
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| 35. | If the belt is wrapped about the wheels so as to cross, the interior tangent line segments are relevant.
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| 36. | The tangent line ( in green ) which passes through the point has a slope of 23 / 4.
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| 37. | The tangent line is a limit of secant lines just as the derivative is a limit of difference quotients.
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| 38. | The resulting geometrical figure of circle and tangent line has a reflection symmetry about the axis of the radius.
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| 39. | The tangent line of an orthogonal trajectory is perpendicular to the tangent line of the circle, and vice versa.
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| 40. | Eventually this produces a plane curve whose only singularities are ordinary multiple points ( all tangent lines have multiplicity 1 ).
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