1. Warm Up 2/22/16  Which vertices form a square?  A rhombus?  A rectangle? Justify your answers.

2. Announcements  Test on Thursday  Review Part I due tomorrow

3. A quadrilateral is a rhombus if…  It is a parallelogram with perpendicular diagonals, OR  It is a parallelogram with a diagonal that bisects a pair of opposite angles. Draw a parallelogram with markings that show perpendicular diagonals. Draw a parallelogram with markings that show a diagonal bisecting a pair of opposite angles.

4. A quadrilateral is a rectangle if…  It is a parallelogram with congruent diagonals. Draw a parallelogram with markings that show congruent diagonals.

5. A quadrilateral is a square if…  It is a parallelogram with congruent, perpendicular diagonals. Draw a parallelogram with markings that show congruent, perpendicular diagonals.

6. Example 1  Can you conclude that quadrilateral ABCD is a rhombus, rectangle, or square? Explain.

7. You try…  Can you conclude that quadrilateral ABCD is a rhombus, rectangle, or square? Explain.

12. Classwork p 279 #1-7