The dimensions of a whiteboard with a frame are 2.5 feet by 3.5 feet. What is its perimeter?

Rationale

The perimeter of the whiteboard is 12 ft.

The perimeter of a rectangle is calculated by the formula P = 2(length + width). For the given dimensions of 2.5 feet and 3.5 feet, the perimeter sums to 12 feet.

A (13 ft) YOUR ANSWER

This option incorrectly calculates the perimeter by possibly adding only one dimension to the other or misapplying the perimeter formula. The correct calculation requires multiplying the sum of both dimensions by 2, which does not yield 13 feet.

B (12 ft) CORRECT

This is the correct answer. The perimeter calculation follows the formula P = 2(2.5 ft + 3.5 ft), which equals 2(6 ft) = 12 ft. This properly accounts for both dimensions of the rectangle.

C (9.75 ft) YOUR ANSWER

This choice likely results from an arithmetic error, such as incorrectly summing the dimensions or applying the perimeter formula improperly. The perimeter should be larger than this value, given the dimensions provided.

D (8.75 ft) YOUR ANSWER

This option also represents a miscalculation of the perimeter. It may stem from misinterpreting the formula or incorrectly adding the dimensions. The perimeter for the stated dimensions must exceed this value, confirming it as incorrect.

Conclusion

The proper calculation of the perimeter for a rectangle involves adding both dimensions and multiplying by two. Here, with dimensions of 2.5 feet and 3.5 feet, the resulting perimeter is conclusively 12 feet. All other options reflect miscalculations or misunderstandings of the perimeter formula.

The dimensions of a whiteboard with a frame are 2.5 feet by 3.5 feet. What is its perimeter?

The perimeter of the whiteboard is 12 ft.

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