The diagonal of a square is 4 ?2 cm. What will be the diameter of another square if their area is double that of the first square?  Select:
A) 8cm B) 9cm C) 10cm D) 11cm E) 12cm
d1=4 ? 2 =&gt; area = 1/2d12=1/2 * (4 ? 2)2 = 16cm2   8cmrea of new square = (2*16)cm2 = 32 cm2   Therefore 1/2*d22=32 =&gt;d22=64 =&gt; d2=8cm   8cmnswer 8cm
<result>A</result>
The diagonal of a square is 4 ?2 cm. What will be the diameter of another square if their area is double that of the first square?