Question 21

The area of a square is $$40.5 cm^{2}$$. Find the length of its diagonal (in cm).

Solution

Let side of square = $$s$$ cm and its diagonal = $$d$$ cm

Area = $$s^2=40.5$$

Now, $$d^2=s^2+s^2$$

=> $$d^2=40.5+40.5=81$$

=> $$d=\sqrt{81}=9$$ cm

=> Ans - (A)

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