**- plain figure with four straight sides and four right angles.**

__Rectangle__**- plain figure having four straight sides with opposite sides parallel.**

__Parallelogram__- no rounded edges
- four corners
- a rectangle is a parallelogram
- they both have parallel sides
- they both have four sides

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