The height of a cylinder is 6.28 decimeters, and its side is a square. What is the approximate surface area of this cylinder? (The final result retains one decimal place)
一个圆柱的高是6.28分米，它的侧面展开是一个正方形，这个圆柱的表面积约是多少平方分米．(最后结果保留一位小数)
<result>45.7</result>