Geometry

Question Analysis:
This question checks fast proof strategies.
The main focus is parallel sides for trapezoid proof.

Key Concept Explanation:
Trapezoids need only one pair of parallel sides.

Step-by-Step Solution:
Use slope formula to show top and bottom sides are parallel.

Option Analysis:
A. Side lengths are unnecessary.
B. Correct. One slope match proves trapezoid.
C. Congruent sides aren't required.
D. Diagonal midpoints are for parallelograms.

Common Mistakes:
Assuming all trapezoids have ...