Answer
VRST is an isosceles trapezoid.
Work Step by Step
To be isosceles, this trapezoid must have VR equal TS. Thus, we use the distance formula:
$TS = \sqrt{(c-d-c)^2 + (e-b)^2 }= \sqrt{(d)^2 + (e-b)^2 }$
$VR = \sqrt{(a-a+d)^2 + (e-b)^2 } =\sqrt{(d)^2 + (e-b)^2 }$
These values are the same, so the trapezoid is isosceles.
