If the area of a sector whose central angle is 45 degrees is 18 square centimeters, what is the area of the circle it is in?
一个圆心角是45度的扇形的面积是18平方厘米，它所在的圆的面积是多少平方厘米．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">18 / (1/8)</gadget>
<output>144</output>

<result>144</result>