Use a Formula for Perimeter or Area to Solve the Problem

Multiple Choice

Use a formula for perimeter or area to solve the problem.
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Find the area of the square.

A) $18 \mathrm { in } ^ { 2 }$
B) $13 \mathrm { in } ^ { 2 }$
C) 81 in. $^ { 2 }$
D) 36 in. $^ { 2 }$