The error would be assuming the altitude is a bisector and divides the sides evenly.
Answer:

Step-by-step explanation:
The formula for the area of rectangle is length times width:

Use FOIL method:

5/6 is an answer to this question.....
Answer:
42.06 ft²
Step-by-step explanation:
2 sides = 2(2.7 ft × 3.2 ft) = 2 × 8.64 ft² = 17.28 ft²
Front + back = 2(2.1 ft × 3.2 ft) = 2 × 6.72 ft² = 13.44 ft²
Top + bottom = 2(2.1 ft × 2.7 ft) = 2 × 5.67 ft² = <u>11.34 ft²
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Total area = 42.06 ft²