It is known that the diameter of a circular flower bed is 4 meters, and a path with a width of 1 meter is paved along its outside, find the area of the path. (accurate to 0.1 square meters)
已知一个圆形花坛的直径是4米，沿它的外侧铺一条1米宽的小路，求这条小路的面积．(精确到0.1平方米)
<result>1.57</result>