The diagonals of two squares are in the ratio of 2 : 5 . Find he ratio of their areas .
Let the diagonals of the squares be `2x and 5x` respectively.
`:.` Ratio of their areas = `1/2 xx (2x)^2 : 1/2 xx (5x)^2`
= `4x^2 : 25x^2`
= 4 : 25
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