Question 1056351
this is an isosceles trapezoid what is y i will try to illustrate it
               
                        R______________________S
                         \               74deg/
                          \                  /
                           \                /
                            \              /
                             \y          x/
                            T_\__________/U

sorry everything moves to the left
==================
Another tutor said earlier to use
rev inside < >
Then enter the sketch
Then /rev inside < >