DS: in the figure above, what is the ratio KM/MN. (1) the perimeter of rectangle KLMN is 30 meters. (2) the three small rectangle have the same dimensions.
In the figure above, a square is inscribed in a circle. if the area of the square is 16, what is the area of the circular region? 图呢,就是一个正方形,外接一个圆,四个角和圆周相切的那种。