A circular flower bed with a diameter of 12 meters is to be built in the park in the middle of the street, and a 3-meter-wide path is paved around it with tiles. The area of each tile is 0.9 square meters. How many tiles are needed to pave this path?
街心公园要修一个直径为12米的圆形花坛，周围用瓷砖铺一条3米宽的小路，每块瓷砖面积为0.9平方米，铺这条小路需瓷砖多少块？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">81 - 36</gadget>
<output>45</output>

<gadget id="calculator">3.14 * 45</gadget>
<output>141.3</output>

<gadget id="calculator">141.3 / 0.9</gadget>
<output>157</output>

<result>157</result>