By Mansi Yadav

Verified by Ajay Kumar

A square tile has area 72 cm². What is the length of each side in simplest surd form?

  1. \(6\sqrt{2}\) cm

  2. \(\sqrt{72}\) cm

  3. 12 cm

  4. \(4\sqrt{3}\) cm

Answer: A

Solution

Solution: For a square, area \(=s^2\). Thus, \(s=\sqrt{72}=\sqrt{36\times2}=6\sqrt{2}\) cm. Trick: Take the square root of the area and extract the largest perfect-square factor. Source note: Option B, \(\sqrt{72}\) cm, is mathematically equivalent to option A; the PDF marks option A in green.

Community answers

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  1. Option B\(\sqrt{72}\) cm

    Just do the square root of 72

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