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Wednesday, April 4, 2012

Similarities Between Rectangles & Parallelogram & How to Calculate Area of Each

Rectangle - plain figure with four straight sides and four right angles. 
Parallelogram - plain figure having four straight sides with opposite sides parallel.
  • no rounded edges
  • four corners
  • a rectangle is a parallelogram
  • they both have parallel sides
  • they both have four sides
Student #1:  makes a parallelogram of 4 square units
Student #2:  makes a rectangle with the same base and area as Student #1's parallelogram What else is the same about the 2 geoboards?
Answer:

Student #2:  makes a parallelogram of 6 square units
Student #1:makes a rectangle with the same base and area as Student #2's parallelogram What else is the same about the 2 geoboards?
Answer:

Student #1:  makes a parallelogram of 8 square units
Student #2:  makes a rectangle with the same base and area as Student #1's parallelogram What else is the same about the 2 geoboards?
Answer:

Student #2:  makes a parallelogram of 10 square units
Student #1:  makes a rectangle with the same base and area as Student #2's parallelogram What else is the same about the 2 geoboards?
Answer:


Virtual geoboard for exploring the area of rectangles and parallelograms:
http://www.mathplayground.com/geoboard.html