The Properties of a Parallelogram
Definitions and formulas for the perimeter of a parallelogram, the area of a parallelogram, properties of the sides and angles of a parallelogram
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perimeter of a parallelogram  area of a parallelogram 
properties of the sides and angles of a parallelogram 
other properties of the angles of a parallelogram 
The perimeter of a parallelogram:  
To find the perimeter of a parallelogram, just add up all the lengths of the sides: Perimeter = a + b + a + b 

The area of a parallelogram:  
To find the area of a parallelogram, just multiply the base length (b) times the height (h): Area = b x h 

Yeah, that's the formula... But let's check out where it comes from! 
Let's cut off a piece and move it... 
Now, it's a rectangle! 
The sides and angles of a parallelogram: 
Opposite sides of a parallelogram are the same length (congruent). Opposite angles of a parallelogram are the same size/measure (congruent.) Opposite sides of a parallelogram are parallel... Uh... You think that's where it got it's name? 
Other properties of the angles of a parallelogram:  
Adjacent sides (ones next to each other) of a parallelogram are supplementary. This means that their measures add up to 180 degrees. 