CD is a line segemnt, ABCD is a trapezoid. Is that what you're trying to find the area & perimeter for?
Perimeter should be rather simple ... what do you get?
Area of a trapezoid is $\dfrac{h}{2}(b_1+b_2)$ where $b_1$ and $b_2$ are the parallel bases.
Where, exactly, are you having trouble?