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Answer:
use the given information along with the necessary algebraic, trigonometric, and/or geometric relations
Explanation:
As a rule, you must start from what you do know, which can include information about the rectangle and any relations that tell how that information is related to the rectangle dimensions.
For example, if you have the length of a diagonal and the aspect ratio of the rectangle (length/width), you can use the Pythagorean theorem to find the rectangle dimensions. An internal angle (with the diagonal), or the angle at the crossing of diagonals will also serve in place of the aspect ratio.
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