If the sector has a radius of 6 cm and a central angle of 90°, what is its area in square centimeters?
如果扇形的半径为6厘米，圆心角为90°，那么它的面积是多少平方厘米．
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * 36 * (1/4)</gadget>
<output>28.26</output>

<result>28.26</result>