Question

Find perimeter of a square if its diagonal is $7\sqrt{2}cm$

• A. $28\sqrt{2}cm$
• B. 28 cm
• C. $28\sqrt{8}cm$
• D. 14 cm

Answer 1

Answer: (B)

28 cm

Diagonal of square $=\sqrt{2}a$

$7\sqrt{2}=\sqrt{2}a$

So $a=7$cm

Perimeter $=4a$

$=4\times 7$

$=28$cm.