The base of a cuboid is a square with an area of 4 square meters, and its side view is also a square. What is the side area of the cuboid in square meters?
一个长方体的底面是面积为4平方米的正方形，它的侧面展开图正好也是一个正方形，这个长方体的侧面积是多少平方米．
<gadget id="calculator">4 * 16</gadget>
<output>64</output>

<result>64</result>