Rectangles, Squares, and Rhombuses

Rectangles, Squares, and Rhombuses (Special Parallelograms)

Prop. of Parallelograms:

• both pairs of opposite sides are parallel
• both pairs of opposite sides are congruent
• the diagonals bisect each other
• both pairs of opposite angles are congruent

Rectangles:

• 4 right angles
• diagonals are congruent
  
• prop. of a parallelogram

Rhombuses:

• all 4 sides are congruent
• the diagonals are perpendicular to each other
• the diagonals bisect opposite angles
• all properties of a parallelogram
  

Squares:

• all properties of a rhombus
• all properties of a rectangle
• all properties of a parallelogram

Always, Sometimes, Or Never

1. If an angle of a parallelogram is a right angle then is it a rectangle?
2. Is a square a rectangle?
3. Is a rectangle a square?
4. If a diagonal bisects 2 angles then is it a square?
5. If the diagonals of a parallelogram are perpendicular to each other then is it a rectangle?

1.always 2.always 3.sometimes 4.sometimes 5.sometimes

HERE ARE SOME HELPFUL VIDEOS

http://vimeo.com/15571270 <- the teacher in that one is a little wacky, but it helps

http://www.5min.com/Video/How-to-Use-the-Properties-of-Special-Parallelograms-516909821

AND THE NEXT SCRIBE ISSSSSSSSS..................

EMMA! (your welcome)

AND THATS IT FOR TONIGHT THANKS FOR READING SPECIAL PARALLELOGRAMS!!!!!

by, Jessica Young