Answers

2015-02-16T21:46:59+08:00
Isosceles Trapezoid Theorems:
 A trapezoid is isosceles if the base angles are congruent.    
 A trapezoid is isosceles if the diagonals are congruent.    
If a trapezoid is isosceles, the opposite angles are supplementary.

I think those are only the trapezoid theorem because those are only what my teacher have discussed.
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