1. Warm Up
1. Date: 2/27/12
Factor the expression by finding the greatest common factor (GCF).
y= 3x2 +18x +45
y = 3(x2 +6x +15)

3. A rhombus is a parallelogram with four congruent sides.
A rectangle is a parallelogram with four congruent angles.
(four right angles)
A square is a parallelogram with four congruent sides and four congruent angles.

7. The statement is always true.
The statement is sometimes true.

8. All four sides are congruent, so the quadrilateral is at least a rhombus. The given angle is not 90, so this cannot be a square. The quadrilateral is a rhombus.
Always true, all sides in a square are congruent.
Four congruent sides and four congruent angles is a square.

11. a. No, we are given that opposite sides are congruent, so all we can say is that the frame is a parallelogram.
b. Since the diagonals are congruent, we can say the the frame is a rectangle because diagonals in a rectangle are congruent.

12. opposite sides congruent
Rhombuses
Rectangles
Squares
four congruent sides
four congruent angles

13. A statement that can be broken into two statements.
Conditional statement : If a parallelogram is a rhombus, then it has four congruent sides.
Converse: If a parallelogram has four congruent sides, then it is a rhombus.