According to the definition of the median of the trapezoid: B. The length of the median is half the sum of the lengths of the bases.
The median of a trapezoid is the line segment that connects the two legs of a trapezoid and is parallel to each of the base of the trapezoid. Also, the length equals half of the sum of the two base lengths of the trapezoid.
Thus, based on the definition of the median of a trapezoid, the true statement is: B. The length of the median is half the sum of the lengths of the bases.
Learn more about the median of a trapezoid on:
https://brainly.com/question/1451734
#SPJ1