Quadratic graph lines are U- or Õˆ-shaped, which is called a parabola. A linear graph can be drawn using only three points. A quadratic graph is a curve, so more points are plotted to support accuracy.
It is also possible to have a conversion graph to switch between units that are not directly proportional. For example, temperature can be measured in degrees Centigrade (°C) and degrees Fahrenheit ...
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