math

If d length n breath of a rectangle r increased by 10% then by wt %wiil the area increase?

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asked by Khusbu
  1. If the shapes are similar, area increase as the square of the ratio of the lengths.

    In this case, the shape remains the same,
    so
    old area = d*n
    new area = (1.1d)(1.1n)
    = (1.1)² dn
    = (1.1)² old area
    Percentage increase in area
    = 1.1²-1
    = 21%

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