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Geometry and Trigonometry / Area and volume Difficulty: Easy

A rectangle has a length of $3$ units and a width of $39$ units. Which expression gives the area, in square units, of this rectangle?

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Explanation

Choice D is correct. The area of a rectangle is given by $l w$ , where $l$ is the length of the rectangle and $w$ is the width of the rectangle. It's given that a rectangle has a length of $3$ units and a width of $39$ units. It follows that the area of the rectangle is $3 dot 39$ square units. Therefore, the expression that gives the area, in square units, of this rectangle, is $3 dot 39$ .

Choice A is incorrect. This expression gives the perimeter, in units, of this rectangle.

Choice B is incorrect and may result from conceptual errors.

Choice C is incorrect and may result from conceptual errors.