There is a square lawn with a side length of 20 meters. Around the edge of the lawn, a circle of square bricks with a side length of 0.5 meters is laid on the outside. How many square bricks are needed in total? How many
有一块边长为20米的正方形草地，今绕着草地的边沿，在外侧铺一圈边长为0.5米的方砖，那么共需方砖多少块？多少
<gadget id="calculator">4 / 0.5</gadget>
<output>8</output>

<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">160 + 4</gadget>
<output>164</output>

<result>164</result>