# Math Help - Trapezoids

1. ## Trapezoids

If AB = 21 and EF = 18 then DC = ?

EF is the median
AB is the base
DC is the top

could someone help me please???

2. Originally Posted by lax600
If AB = 21 and EF = 18 then DC = ?
EF is the median, AB is the base, DC is the top
The length of the median is the average of the two lengths of the bases.