Problem: Let be a quadrilateral with extended to so that . Lines and are drawn to form angle . For this angle to be a right angle it is necessary that quadrilateral have:
Answer Choices:
A. all angles equal
B. all sides equal
C. two pairs of equal sides
D. one pair of equal sides
E. one pair of equal angles
Solution:
Since is the median to the hypotenuse of right triangle ,
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