On graph paper, plot quadrilateral $ABCD$.  

$A(2,7)$, $B(4,8)$, $C(4,2)$, $D(2,3)$

1. What is the best name for this shape? Justify your conclusion.

   Answer (a):

   An isosceles trapezoid. Why?

2. Quadrilateral $A'B'C'D'$ is formed by rotating $ABCD$ $90º$ clockwise about the origin. Name the coordinates of the vertices.

3. Find the area of $ABCD$. Show all work.

   More Help (c):

   $\text{Area of a trapezoid}=\frac{1}{2}(b_1+b_2)h$