Question 976740
Let b and t be the lengths of each parallel side.  Let A=187 for area.  Let h=22 for height.  Let b=6, for one of the parallel sides so that t is unknown.


{{{A=h(1/2)(b+t)}}}, so that the average of the two bases will be used.


{{{b+t=2A/h}}}


{{{highlight(t=2A/h-b)}}}


{{{t=2*187/22-6}}}