Find the area of this trapezoid. all length measures are in centimeters.

 we know that
The area of a trapezoid is given by the formula
Area=h*(b1+b2)/2
 where
b1, b2 are the lengths of each base
h is the altitude (height)
Remember  that the bases are the two parallel sides of the trapezoid. The altitude (or height) of a trapezoid is the perpendicular distance between the two bases

 therefore 
[area of trapezoid]=(11+5)*4/2> 64/2> 32 cm²

the answer is 32 cm²