Area selection between three curves

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I would like to calculate the area on Oxy plane between the curves y=x^2, y=2, y=2x. These curves define two areas R1 and R2, as shown below. I know how to calculate the area but my question is which area to select R1 or R2? Is there a rule on how to decide which area is meant if you asked to calculate the area between these curves? enter image description here