GAUSS8 2016 Problem 7

Past Contests GAUSS8 GAUSS (GR. 8) - 2016
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1

A rectangle with a width of 2\:cm and a length of 18\:cm has the same area as a square with a side length of

Answer Choices
A. 6\:cm
B. 12\:cm
C. 9\:cm
D. 10\:cm
E. 8\:cm