The height of trapezoid vwxz is 8 startroot 3 endroot units. the upper base, vw, measures 10 units. use the 30°-60°-90° triangle theorem to find the length of yx. trapezoid v w x z is shown. a line is drawn from point w to point y on side z x, forming a right angle. angles w v z and v z y are right angles. the length of v w is 10 and the length of w y is 8 startroot 3 endroot. angle yw x is 30 degrees, and angle w x y is 60 degrees. once you you know the length of yx, find the length of the lower base, zx. 14 units 10 + 4 startroot 3 endroot units 18 units 10 + 8 startroot 3 endroot units