The central angle of a sector is 135°, and the area is 180 square centimeters. What is the area of a circle drawn with the radius of this sector?
一个扇形的圆心角是135°，面积是180平方厘米，以这个扇形的半径所作圆的面积是多少．
<gadget id="calculator">135 / 360</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">180 / (3/8)</gadget>
<output>480</output>

<result>480</result>