The triangular region shows the number of possible ounces of plantinum, x, and the number of possible ounces of silver ,y, a jew
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<h2>★<u>Answer</u></h2>
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- The properties of trapezoid apply by definition (parallel bases).
- The legs are congruent by definition.
- The lower base angles are congruent.
- The upper base angles are congruent.
- Any lower base angle is supplementary to any upper base angle.