Quadrilaterals Day 3

Today's lesson began with a discussion and an activity investigating parallelograms with more properties: Rectangle, Rhombus, and Square. These are parallelograms, so they still have the 5 properties specific to parallelogram and the 2 properties specific to all quadrilaterals. In addition to them, we added more.

For Rectangles:

1. Definition: a parallelogram with 4 congruent angles (all 90º)
2. diagonals are congruent

For Rhombuses:

1. Definition: a parallelogram with 4 congruent sides (think of a diamond shape)
2. diagonals are perpendicular
3. each diagonal bisects a pair of opposite angles

For Squares:

1. Definition: a parallelogram with 4 congruent sides AND 4 congruent angles
2. Because a square is BOTH a rhombus and a rectangle, it has ALL properties previously mentioned!

Homework: Page 319, #2 - 18 even; Page 321, #2 - 18 even, #28

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