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

  • math -

    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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