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The earliest recording of Tangrams was in a Chinese book in the year 1813. It is a dissection puzzle with 7 pieces that fit together to form some shape of art.
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A parallelogram is a "sat-on" rectangle; opposite sides are equal in length → perimeter = 7 + 11 + 7 + 11 inches = 36 inches.
You cannot have a 2 piece tangram. A tangram, by definition, is 7 pieces.
The area of a parallelogram is calculated by multiplying the length of the base by the height. In this case, the base is 3 feet and the height is 7 feet. Therefore, the area of the parallelogram is 3 feet * 7 feet = 21 square feet.