Question 18016
A trapezoid is a quadrilateral with only two sides parallel. 
The area would be {{{(1/2)H*(B[1]+B[2])}}} sq units

EXAMPLE:
{{{B[1]=3 in}}} and {{{B[2]=7 in}}} and {{{H=4 in}}}
{{{(1/2)*4*(3+7)=20 in^2}}}
Hope this helps!