A square pond has a side length of 40 meters. Uncle Zhang walks around the side of the pond 8 times every morning. How many meters has he walked in total?
一个正方形池塘，边长40米，张伯伯每天早晨绕池塘的边走8圈，一共走了多少米？
<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<gadget id="calculator">160 * 8</gadget>
<output>1_280</output>

<result>1_280</result>