Sally is calculating the perimeters of a number of rectangles, such as the one shown here. She uses the formula P = 2l + 2w. Her younger brother Joe comes by and suggests simplifying the formula to P = 4w. Sally corrects Joe's algebra, but he tries his formula on a rectangle and gets the correct answer! (She checks his work.) What can Sally conclude from this?
Joe's rectangle is oblong.
Joe's rectangle is a square.
Joe's rectangle has no length.
Joe's rectangle wider than it is
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B. Joe's rectangle is a square.
The formula for the perimeter of a square is x+x+x+x or 4x
**Some rectangles are squares because it holds the properties of a square, as it this case, though it won't happen all the time**