There is a circular mirror with a radius of 5 cm. If the radius of the mirror is increased by 5 cm, the area of the resulting large circle will increase by π square centimeters compared to the area of the original circle.
有一面圆形镜子的半径为5厘米，如果把它的半径增加5厘米，所得的大圆的面积比原来圆形的面积增加多少π平方厘米．
<result>75</result>