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Question 130
If the perimeter of a square is 80 cm, then what is the diagonal of the square (in cm)?
Solution
Let side of square = $$s$$ cm
=> Perimeter = $$4s=80$$
=> $$s=\frac{80}{4}=20$$ cm
Thus, diagonal = $$d=\sqrt{s^2+s^2}$$
=> $$d=s\sqrt2$$
=> $$d=20\sqrt2$$ cm
=> Ans - (A)
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