1. The area is 81 square feet. The provided answer of "81 sq cm" is incorrect because the side length is given in feet, so the area must be in square feet.
2. The perimeter is 22 centimeters. The formula for the perimeter of a rectangle is P = 2(l + w). So, P = 2(7 cm + 4 cm) = 2(11 cm) = 22 cm.
3. The width cannot be determined with the given information. To find the width, you need either the length or another piece of information (like the area). With only the perimeter (40 cm), there are infinitely many possible combinations of length and width that satisfy the equation P = 2(l + w).
4. The width and length cannot be uniquely determined with the given information. Knowing only the perimeter (70 cm) means there are many possible pairs of length and width (e.g., 30 cm & 5 cm, 25 cm & 10 cm, etc.) that satisfy the equation P = 2(l + w).
5. The perimeter is 52 centimeters. Using the formula P = 2(l + w), we get P = 2(24 cm + 2 cm) = 2(26 cm) = 52 cm.
6. The perimeter is 220 meters. Using the formula P = 2(l + w), we get P = 2(75 m + 35 m) = 2(110 m) = 220 m.
Parent Tip: Review the logic above to help your child master the concept of area and perimeter worksheet for 4th grade.
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