Answer:
○ d. No other length can be determined.
Explanation:
In a parallelogram, opposite angles are congruent, diagonals form a linear pair, and it has two pairs of parallel sides. Therefore, according to the information we are given, no other length can be determined.
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* Answer choice a fails because of the Pythagorean Theorem. If we split the circumscribed right triangles, we can see that having a leg equal to a hypotenuse is impossible, therefore this is incorrect.