What is the area of a sector with a central angle of 45 degrees and a radius of 8 cm?
圆心角为45度，半径是8厘米的扇形，这个扇形的面积是多少？
<gadget id="calculator">45 / 360</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">(1/8) * 3.14 * 64</gadget>
<output>25.12</output>

<result>25.12</result>