A.

1. It is a closed figure with straight sides.

2. It has only two diagonals.

3. Its diagonals bisect each other.

4. Its opposite angles are bisected by its diagonals.

5. Both of its diagonals lie on lines of symmetry.

6. Its diagonals have the same length.

B.

1. It is a closed figure with straight sides.

2. It has sides of two different lengths.

3. Each of its short sides has length 2r.

4. Each of its long sides has length 3r.

5. Its perimeter is 10r.

6. Its short sides are perpendicular to its long sides.

7. Its opposite angles are congruent.

C.

1. It is a closed figure with straight sides.

2. One of its angle bisectors lies on the perpendicular bisector of one of its sides.

3. Another of its angle bisectors lies on the perpendicular bisector of one of its sides.

4. It angle bisectors are congruent.

5. The sum of the measures of all of its angles is 180 degrees.

D.

1. It is a closed figure with straight sides.

2. Each of its long sides has length 8m.

3. Each of its short sides has length 4m.

4. It has only two diagonals.

5. Its perimeter is 24m.

6. Its diagonals bisect each other.

7. It has a diagonal of length 9m.