Consider the following trapezoid.
Find the value of $m\angle B$m∠B.
Find the value of $m\angle C$m∠C.
Find the value of $m\angle D$m∠D.
Consider the following trapezoid $JKLM$JKLM, where $KM=20$KM=20.
Consider the following trapezoid.
Solve for the value of $x$x.
Consider the following trapezoid $CDEF$CDEF, in which $EC=21$EC=21 and $FD=6x-9$FD=6x−9.
Determine the value of $x$x.