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A greeting card has an area 90 cm^2. Between what two whole numbers is the length of its side?

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A greeting card has an area 90 cm2. Between what two whole numbers is the length of its side?

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Area of the greeting card = 90 cm2

(side)2 = 90 cm2

side = 3√2 x 5

side = √10 cm

side = 3 × 3.2 cm

side = 9.6 cm

∴ Side lies between the whole numbers 9 and 10.

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