For problems 1 and 2, use quadrilateral ABCD. 1. (2 points) Find the exact perimeter of quadrilateral ABCD. B 5 C X, -5 D 2. (4 points) Is quadrilateral ABCD a rectangle? Provide justification for your decision using the grid or by explanation. NAME DATE PERIOD For problem 7, rewrite the equation using completing the square so that it can be easily graphed, and then graph the shape below. Indicate the important features (center, radius, or focus, vertex, directrix) on the graph, and list them. 7. (4 points). x2 + y2 + 8x - 6y + 21 =0 Center: Radius: Equation