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28 October, 04:24

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?

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  1. 28 October, 05:06
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    The rectangle has equal sides on all four sides which means the shape is a square since a square can be considered a rectangle.
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Home » Mathematics » 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.
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